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Dee One
Joined: 29 Jun 2015
Posts: 48
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 Posted: Fri Aug 14, 2015 6:29 pm Post subject: Primer Bulb |
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I'm in the process of rebuilding my Mk3 and installing a new Rotax 582 engine. For duplicity I'm installing a dual fuel supply system in parallel; one diaphragm pulse pump (the one that is supplied with the engine) with pre-filter and one electric-driven "Facet" electronic pump with pre-filter. Each line will go to a check valve manifold near the carbs. Also, I'm installing a fuel pressure gauge to insure I have the correct pressure at the carbs.
My question is : since the electric pump can delivery pressure to the carbs on startup, is a fuel primer bulb really needed on the pulse pump line?
Thanks for your advice,
Dee
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Fri Aug 14, 2015 7:04 pm Post subject: Primer Bulb |
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On Fri, Aug 14, 2015 at 8:29 PM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | --> Kolb-List message posted by: "Dee One" <leblancds(at)cox.net (leblancds(at)cox.net)>
My question is : since the electric pump can delivery pressure to the carbs on startup, is a fuel primer bulb really needed on the pulse pump line?
Thanks for your advice,
Dee
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I have never used a primer bulb on any of the engines that I have used a facet on and had a problem, but every squeeze bulb that I ever had caused me nothing but trouble.
Larry
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henry.voris
Joined: 02 Mar 2007
Posts: 116
Location: Pueo Field, Kula, Maui
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| Posted: Sat Aug 15, 2015 7:28 am Post subject: Re: Primer Bulb |
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I agree with Larry 100%... Every squeeze ball I have had has caused me nothing but trouble. I don't have a battery in my FireFly... I installed a tire valve on the top of my fuel tank. To get fuel up to the floats I put a piece of tape over the breather vent in the filler cap and use a bicycle pump to pressurize the tank... For me, simple works best.
Aloha,
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Henry
Firefly Five-Charlie-Bravo
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Herbgh(at)nctc.com
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| Posted: Sat Aug 15, 2015 8:08 am Post subject: Primer Bulb |
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Why not use the squeeze bulb to pressurize the tank? That is what I
did...Herb
On 08/15/2015 10:28 AM, henry.voris wrote:
| Quote: |
I agree with Larry 100%... Every squeeze ball I have had has caused me nothing but trouble. I don't have a battery in my FireFly... I installed a tire valve on the top of my fuel tank. To get fuel up to the floats I put a piece of tape over the breather vent in the filler cap and use a bicycle pump to pressurize the tank... For me, simple works best.
Aloha,
--------
Henry
Firefly Five-Charlie-Bravo
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henry.voris
Joined: 02 Mar 2007
Posts: 116
Location: Pueo Field, Kula, Maui
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| Posted: Sat Aug 15, 2015 10:46 am Post subject: Re: Primer Bulb |
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Herb, you're light years ahead of me pal... I have no idea how to rig a squeeze bulb to pressurize the fuel tank...
The reason I don't use a squeeze bulb to lift the fuel from the tank up to the floats is I've had them fail on me, twice.
Aloha,
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Herbgh(at)nctc.com
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| Posted: Sat Aug 15, 2015 12:04 pm Post subject: Primer Bulb |
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Just hook the output side of the bulb to the tank via a piece of hose
and a threaded nipple attached to the tank cap... make sure that you
can cover the vent hole with your finger... and just squeeze...8 or 10
squeezes and the tank is pressurized and forces the fuel to the carb...
Beats the bypassing of the bulb...
On my first Firefly, I used a squeeze bulb from an Merkur Scorpio. It
was used to pump the adjustment for the lumbar support in the seat
back..... Looked just like the one from the manual blood pressure gauge..
You can make a nipple by cutting the threads from bolt....one with
long threads...just drill a hole through it... install the outside nut
so that you have 1/2 inch of threads on the outside..with the nut
on...grind the threads away so that the hose will fit well....then drill
the cap...attach the inside nut...maybe a washer to seal....and you are
home free...
Herb
On 08/15/2015 01:46 PM, henry.voris wrote:
| Quote: |
Herb, you're light years ahead of me pal... I have no idea how to rig a squeeze bulb to pressurize the fuel tank...
The reason I don't use a squeeze bulb to lift the fuel from the tank up to the floats is I've had them fail on me, twice.
Aloha,
--------
Henry
Firefly Five-Charlie-Bravo
Do Not Archive
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http://forums.matronics.com/viewtopic.php?p=445993#445993
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Dee One
Joined: 29 Jun 2015
Posts: 48
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| Posted: Sat Aug 15, 2015 12:12 pm Post subject: Primer Bulb |
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So if I have an electric pump (Facet) on one of my two fuel lines to the carbs and flip the switch, should I need any other means to prime the carbs? Dee LeBlanc
leblancds(at)cox.net (leblancds(at)cox.net)
cell 225-802-1038
~~~~~~~~~~~~~~~~
The Past is History
The Future is a Mystery
Today is a Gift
Thats Why They Call it the Present
| Quote: | On Aug 15, 2015, at 3:04 PM, Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)> wrote:
--> Kolb-List message posted by: Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)>Just hook the output side of the bulb to the tank via a piece of hose and a threaded nipple attached to the tank cap... make sure that you can cover the vent hole with your finger... and just squeeze...8 or 10 squeezes and the tank is pressurized and forces the fuel to the carb... Beats the bypassing of the bulb... On my first Firefly, I used a squeeze bulb from an Merkur Scorpio. It was used to pump the adjustment for the lumbar support in the seat back..... Looked just like the one from the manual blood pressure gauge.. You can make a nipple by cutting the threads from bolt....one with long threads...just drill a hole through it... install the outside nut so that you have 1/2 inch of threads on the outside..with the nut on...grind the threads away so that the hose will fit well....then drill the cap...attach the inside nut...maybe a washer to seal....and you are home free... HerbOn 08/15/2015 01:46 PM, henry.voris wrote: | Quote: | | --> Kolb-List message posted by: "henry.voris" <henry_voris(at)yahoo.com (henry_voris(at)yahoo.com)>Herb, you're light years ahead of me pal... I have no idea how to rig a squeeze bulb to pressurize the fuel tank...The reason I don't use a squeeze bulb to lift the fuel from the tank up to the floats is I've had them fail on me, twice.Aloha,--------HenryFirefly Five-Charlie-BravoDo Not ArchiveRead this topic online here:http://forums.matronics.com/viewtopic.php?p=445993#445993 |
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Sat Aug 15, 2015 12:45 pm Post subject: Primer Bulb |
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On Sat, Aug 15, 2015 at 2:12 PM, Dee LeBlanc <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | So if I have an electric pump (Facet) on one of my two fuel lines to the carbs and flip the switch, should I need any other means to prime the carbs?
Dee LeBlanc
leblancds(at)cox.net (leblancds(at)cox.net)
| Quote: | -> Kolb-List message posted by: Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)>
Just hook the output side of the bulb to the tank via a piece of hose and a threaded nipple attached to the tank cap... make sure that you can cover the vent hole with your finger... and just squeeze...8 or 10 squeezes and the tank is pressurized and forces the fuel to the carb... Beats the bypassing of the bulb...
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You guy's are confusing me.  I am a bit unsure why Herb would want to pressurize his tank when most of us put vent lines in them so they will draw? The only requirement should be to get gasoline to the engine in a positive manner. This of course would be accomplished by the facet fuel pump with or without a squeeze bulb or a pressurized tank. Not having a vent in the tank would sooner or later result in a collapsed tank.
As to Dee's question- with two lines coming from the tank, the facet would get fuel to the engine as long as there was a check valve in the other line. If not then the fuel would take the least resistance and flow back into the tank. I personally do not run two lines. When the facet has pumped fuel into the carbs, you can hear the facet change sound, and its time to either pull the rope or hit the starter. ( Of course this means that you will have acquired the correct facet pressure pump. 3-5 lbs.)
Larry
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Herbgh(at)nctc.com
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| Posted: Sat Aug 15, 2015 1:25 pm Post subject: Primer Bulb |
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I have a vent....I mention that it is necessary to put your finger over the vent when pressurizing the tank to force the gas to the carb...Very simple...and the bulb has no in air failure mode...Herb
all my Kolbs,,,Ultra star, three Fireflys, one MkIII, Slingshot...all had tank vents...hope everyone has a vent...
On 08/15/2015 03:44 PM, Larry Cottrell wrote:
[quote]
On Sat, Aug 15, 2015 at 2:12 PM, Dee LeBlanc <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | So if I have an electric pump (Facet) on one of my two fuel lines to the carbs and flip the switch, should I need any other means to prime the carbs?
Dee LeBlanc
leblancds(at)cox.net (leblancds(at)cox.net)
| Quote: | -> Kolb-List message posted by: Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)>
Just hook the output side of the bulb to the tank via a piece of hose and a threaded nipple attached to the tank cap... make sure that you can cover the vent hole with your finger... and just squeeze...8 or 10 squeezes and the tank is pressurized and forces the fuel to the carb... Beats the bypassing of the bulb...
|
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You guy's are confusing me. I am a bit unsure why Herb would want to pressurize his tank when most of us put vent lines in them so they will draw? The only requirement should be to get gasoline to the engine in a positive manner. This of course would be accomplished by the facet fuel pump with or without a squeeze bulb or a pressurized tank. Not having a vent in the tank would sooner or later result in a collapsed tank.
As to Dee's question- with two lines coming from the tank, the facet would get fuel to the engine as long as there was a check valve in the other line. If not then the fuel would take the least resistance and flow back into the tank. I personally do not run two lines. When the facet has pumped fuel into the carbs, you can hear the facet change sound, and its time to either pull the rope or hit the starter. ( Of course this means that you will have acquired the correct facet pressure pump. 3-5 lbs.)
Larry
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Herbgh(at)nctc.com
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| Posted: Sat Aug 15, 2015 1:28 pm Post subject: Primer Bulb |
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got me thinking....one failure mode that will be perplexing for a while...is the plugged carb float bowl vent. Herb
On 08/15/2015 03:44 PM, Larry Cottrell wrote:
[quote]
On Sat, Aug 15, 2015 at 2:12 PM, Dee LeBlanc <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | So if I have an electric pump (Facet) on one of my two fuel lines to the carbs and flip the switch, should I need any other means to prime the carbs?
Dee LeBlanc
leblancds(at)cox.net (leblancds(at)cox.net)
| Quote: | -> Kolb-List message posted by: Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)>
Just hook the output side of the bulb to the tank via a piece of hose and a threaded nipple attached to the tank cap... make sure that you can cover the vent hole with your finger... and just squeeze...8 or 10 squeezes and the tank is pressurized and forces the fuel to the carb... Beats the bypassing of the bulb...
|
|
You guy's are confusing me. I am a bit unsure why Herb would want to pressurize his tank when most of us put vent lines in them so they will draw? The only requirement should be to get gasoline to the engine in a positive manner. This of course would be accomplished by the facet fuel pump with or without a squeeze bulb or a pressurized tank. Not having a vent in the tank would sooner or later result in a collapsed tank.
As to Dee's question- with two lines coming from the tank, the facet would get fuel to the engine as long as there was a check valve in the other line. If not then the fuel would take the least resistance and flow back into the tank. I personally do not run two lines. When the facet has pumped fuel into the carbs, you can hear the facet change sound, and its time to either pull the rope or hit the starter. ( Of course this means that you will have acquired the correct facet pressure pump. 3-5 lbs.)
Larry
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Aug 15, 2015 1:37 pm Post subject: Primer Bulb |
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Ditto on Larry's response. Do not put one of those POS primer bulbs in your fuel system. Completely useless and unnecessary.
Rick Girard
do not archive
On Fri, Aug 14, 2015 at 10:04 PM, Larry Cottrell <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:
| Quote: |
On Fri, Aug 14, 2015 at 8:29 PM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | --> Kolb-List message posted by: "Dee One" <leblancds(at)cox.net (leblancds(at)cox.net)>
My question is : since the electric pump can delivery pressure to the carbs on startup, is a fuel primer bulb really needed on the pulse pump line?
Thanks for your advice,
Dee
------------------------------------------------------------------------------------------------------------------------
|
I have never used a primer bulb on any of the engines that I have used a facet on and had a problem, but every squeeze bulb that I ever had caused me nothing but trouble.
Larry
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Herbgh(at)nctc.com
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| Posted: Sat Aug 15, 2015 1:45 pm Post subject: Primer Bulb |
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work pretty good on boats.!! I would not use one in the main fuel line...but, as I said; work well to pressurize the tank...Herb
On 08/15/2015 04:37 PM, Richard Girard wrote:
[quote] Ditto on Larry's response. Do not put one of those POS primer bulbs in your fuel system. Completely useless and unnecessary.
Rick Girard
do not archive
On Fri, Aug 14, 2015 at 10:04 PM, Larry Cottrell <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:
| Quote: |
On Fri, Aug 14, 2015 at 8:29 PM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | --> Kolb-List message posted by: "Dee One" <leblancds(at)cox.net (leblancds(at)cox.net)>
My question is : since the electric pump can delivery pressure to the carbs on startup, is a fuel primer bulb really needed on the pulse pump line?
Thanks for your advice,
Dee
------------------------------------------------------------------------------------------------------------------------
|
I have never used a primer bulb on any of the engines that I have used a facet on and had a problem, but every squeeze bulb that I ever had caused me nothing but trouble.
Larry
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Dee One
Joined: 29 Jun 2015
Posts: 48
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| Posted: Sun Aug 16, 2015 5:52 am Post subject: Re: Primer Bulb |
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Thanks Larry, your comments are consistent with my thinking. I will forgo the primer bulb and utilize the facet for priming and for duplicity. I do have the check valve manifold at the carbs. Also, the facet is in the 3 to 5 PSI range required for the Rotax 582. Keep those videos coming.
Thanks,
Dee
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Sun Aug 16, 2015 7:45 am Post subject: Primer Bulb |
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Glad to be of assistance. Keep in mind that if you use two fuel lines the check valve is going to have to be in the other line, not where the two lines converge into one.Good luck
Larry
On Sun, Aug 16, 2015 at 7:52 AM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
| Quote: | --> Kolb-List message posted by: "Dee One" <leblancds(at)cox.net (leblancds(at)cox.net)>
Thanks Larry, your comments are consistent with my thinking. I will forgo the primer bulb and utilize the facet for priming and for duplicity. I do have the check valve manifold at the carbs. Also, the facet is in the 3 to 5 PSI range required for the Rotax 582. Keep those videos coming.
Thanks,
Dee
--------
The Past is History
The Future is a Mystery
Today is a Gift
That’s Why They Call it the Present
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=446019#446019
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byoungplumbing(at)gmail.c
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| Posted: Sun Aug 16, 2015 8:15 am Post subject: Primer Bulb |
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Just a quick comment by way of a question... don't both the fct pump and the pulce pump have check valves built in? If so, isn't adding additional check valves just installing more failure points? if they don't have built in check valves then I suppose that they are necessary.... next,,, If there is a failure in one of the pumps,, Will it be necessary to shut that that line and pump off? I'm guessing that the answer to this question is dependent on the type of failure. Or am I just over thinking this?
Boyd Young On Aug 16, 2015 9:48 AM, "Larry Cottrell" <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:[quote]Glad to be of assistance. Keep in mind that if you use two fuel lines the check valve is going to have to be in the other line, not where the two lines converge into one.Good luck
Larry
On Sun, Aug 16, 2015 at 7:52 AM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
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Herbgh(at)nctc.com
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| Posted: Sun Aug 16, 2015 9:19 am Post subject: Primer Bulb |
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I think the space program goes for triple or quadruple redundancy and the computers take a vote!
My thought is that a good ole squeeze bulb would be a good addition to the dual electric fuel pumps.. Accessible from the cockpit... Over the years I have met more than one fellow who did the "squeeze" to stay in the air and get to a safe landing...! Obviously, the dual electric pumps need dual batteries, dual generators and dual regulators.. Herb
On 08/16/2015 11:14 AM, B Young wrote:
[quote]
Just a quick comment by way of a question... don't both the fct pump and the pulce pump have check valves built in? If so, isn't adding additional check valves just installing more failure points? if they don't have built in check valves then I suppose that they are necessary.... next,,, If there is a failure in one of the pumps,, Will it be necessary to shut that that line and pump off? I'm guessing that the answer to this question is dependent on the type of failure. Or am I just over thinking this?
Boyd Young On Aug 16, 2015 9:48 AM, "Larry Cottrell" <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote: | Quote: | Glad to be of assistance. Keep in mind that if you use two fuel lines the check valve is going to have to be in the other line, not where the two lines converge into one. Good luck
Larry
On Sun, Aug 16, 2015 at 7:52 AM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
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gajindra(at)sbcglobal.net
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| Posted: Sun Aug 16, 2015 9:40 am Post subject: Primer Bulb |
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The 582 has a pulse pump, only the facet pump is electric and it is the backup or used to fill fuel lines for startup. This is how I ran my 582 and now my 912ul.
Sent from Samsung tablet
-------- Original message --------
From Herb <Herbgh(at)nctc.com>
Date: 08/16/2015 1:19 PM (GMT-05:00)
To kolb-list(at)matronics.com
Subject Re: Kolb-List: Re: Primer Bulb
I think the space program goes for triple or quadruple redundancy and the computers take a vote!
My thought is that a good ole squeeze bulb would be a good addition to the dual electric fuel pumps.. Accessible from the cockpit... Over the years I have met more than one fellow who did the "squeeze" to stay in the air and get to a safe landing...! Obviously, the dual electric pumps need dual batteries, dual generators and dual regulators.. Herb
On 08/16/2015 11:14 AM, B Young wrote:
[quote]
Just a quick comment by way of a question... don't both the fct pump and the pulce pump have check valves built in? If so, isn't adding additional check valves just installing more failure points? if they don't have built in check valves then I suppose that they are necessary.... next,,, If there is a failure in one of the pumps,, Will it be necessary to shut that that line and pump off? I'm guessing that the answer to this question is dependent on the type of failure. Or am I just over thinking this?
Boyd Young On Aug 16, 2015 9:48 AM, "Larry Cottrell" <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote: | Quote: | Glad to be of assistance. Keep in mind that if you use two fuel lines the check valve is going to have to be in the other line, not where the two lines converge into one. Good luck
Larry
On Sun, Aug 16, 2015 at 7:52 AM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Sun Aug 16, 2015 9:42 am Post subject: Primer Bulb |
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I think the space program goes for triple or quadruple redundancy and the computers take a vote! My thought is that a good ole squeeze bulb would be a good addition to the dual electric fuel pumps.. Accessible from the cockpit... Over the years I have met more than one fellow who did the "squeeze" to stay in the air and get to a safe landing...! Obviously, the dual electric pumps need dual batteries, dual generators and dual regulators.. Herb -----------------------------------------------------------------------------------------------------------------------------
Of course one of those puppy's weigh a bit more than my engine will haul. I find that in most instances if given half a chance it is easier to outsmart yourself than not.
I know for sure that I have gone through about 5 of those squeeze bulbs and had nothing but trouble from every one. Of course the problem with the bulbs is the additives that are added to the fuel supply by the refineries.
For my own plane, I have one line from each tank with a filter on the pickup tube, going to a selector valve, to a facet pump ( with over 600 hours on it) to an inline filter, to the pulse pump, then on to the carbs.
Sometime more is less, but that is a decision that each one of us has to make.
Larry
On Sun, Aug 16, 2015 at 11:19 AM, Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)> wrote:
| Quote: | I think the space program goes for triple or quadruple redundancy and the computers take a vote!
My thought is that a good ole squeeze bulb would be a good addition to the dual electric fuel pumps.. Accessible from the cockpit... Over the years I have met more than one fellow who did the "squeeze" to stay in the air and get to a safe landing...! Obviously, the dual electric pumps need dual batteries, dual generators and dual regulators.. Herb
On 08/16/2015 11:14 AM, B Young wrote:
| Quote: |
Just a quick comment by way of a question... don't both the fct pump and the pulce pump have check valves built in? If so, isn't adding additional check valves just installing more failure points? if they don't have built in check valves then I suppose that they are necessary.... next,,, If there is a failure in one of the pumps,, Will it be necessary to shut that that line and pump off? I'm guessing that the answer to this question is dependent on the type of failure. Or am I just over thinking this?
Boyd Young On Aug 16, 2015 9:48 AM, "Larry Cottrell" <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote: | Quote: | Glad to be of assistance. Keep in mind that if you use two fuel lines the check valve is going to have to be in the other line, not where the two lines converge into one. Good luck
Larry
On Sun, Aug 16, 2015 at 7:52 AM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
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Dee One
Joined: 29 Jun 2015
Posts: 48
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| Posted: Sun Aug 16, 2015 3:37 pm Post subject: Primer Bulb |
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The attached link has an excellent article on fuel delivery systems and components. Heavenbound Aviation is where I purchased the check valve manifold that’s located near the carbs. This can be seen in one of the photos. This article addressed all the subjects we’ve been discussing. Yes Boyd, check valves are needed within the pump to allow a diaphragm-type pump system to function. Also, if one of the pumps fail, it can simply be replaced. Thanks for the opinions all . . . I’m now confident that I’ll not need (nor install) a primer bulb.
http://www.heavenboundaviation.com/wp-content/uploads/2015/01/Fuel-delivery-system-article-with-logo.pdf
Dee LeBlanc
leblancds(at)cox.net (leblancds(at)cox.net)
cell 225-802-1038
~~~~~~~~~~~~~~~~
The Past is History
The Future is a Mystery
Today is a Gift
That’s Why They Call it the Present
| Quote: | On Aug 16, 2015, at 12:42 PM, Gary Jindra <gajindra(at)sbcglobal.net (gajindra(at)sbcglobal.net)> wrote:
The 582 has a pulse pump, only the facet pump is electric and it is the backup or used to fill fuel lines for startup. This is how I ran my 582 and now my 912ul.
Sent from Samsung tablet
-------- Original message --------From Herb <Herbgh(at)nctc.com (Herbgh(at)nctc.com)> Date: 08/16/2015 1:19 PM (GMT-05:00) To kolb-list(at)matronics.com (kolb-list(at)matronics.com) Subject Re: Re: Primer Bulb I think the space program goes for triple or quadruple redundancy and the computers take a vote! My thought is that a good ole squeeze bulb would be a good addition to the dual electric fuel pumps.. Accessible from the cockpit... Over the years I have met more than one fellow who did the "squeeze" to stay in the air and get to a safe landing...! Obviously, the dual electric pumps need dual batteries, dual generators and dual regulators.. Herb On 08/16/2015 11:14 AM, B Young wrote:
| Quote: |
Just a quick comment by way of a question... don't both the fct pump and the pulce pump have check valves built in? If so, isn't adding additional check valves just installing more failure points? if they don't have built in check valves then I suppose that they are necessary.... next,,, If there is a failure in one of the pumps,, Will it be necessary to shut that that line and pump off? I'm guessing that the answer to this question is dependent on the type of failure. Or am I just over thinking this? Boyd Young On Aug 16, 2015 9:48 AM, "Larry Cottrell" <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote: | Quote: | Glad to be of assistance. Keep in mind that if you use two fuel lines the check valve is going to have to be in the other line, not where the two lines converge into one. Good luck
Larry
On Sun, Aug 16, 2015 at 7:52 AM, Dee One <leblancds(at)cox.net (leblancds(at)cox.net)> wrote:
-- If you forward this email, or any part of it, please remove my email address before sending.
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Mon Aug 17, 2015 5:18 am Post subject: Re: Primer Bulb |
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Hate to be the duty curmudgeon, but I had a couple problems with Heavenbound Aviation's guide.
One is that he pictures a fuel filter with a paper filtering element. Will that still allow gas to flow through it if it gets a dose of water?
If you use a good quality filter in your tank, then you can use an inline bronze filter in a transparent case with out any worries. The best tank filter/pickup is a replacement for the ones that go on in-tank car fuel pumps, they are fine mesh nylon, very large with lots of surface area, and pretty cheap.
His description and pictures of using safety wire as a fuel line clamp is simply wrong. He uses one wrap and a straight twist. One wrap fails to secure part of one side, and a straight end is a good way to jab yourself and bleed all over your airplane every time you get near your fuel system. Double wrap and bend the end over like in the attached photo. (found that old filter & line in the scrap bin)
Finally, I suggest never using blue urethane line for anything, period. Soft aluminum fuel line from Aircraft Spruce is cheaper and lasts forever if properly installed. Blue urethane can look good and feel soft, and break without warning. (Guess how I know this?) Good grade NAPA fuel line will still look good on the outside after many years and does not deteriorate, I use that where the aluminum line ends to connect to the carbs, fuel pump, etc.
Worth what ya paid for it.
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