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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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 Posted: Fri Dec 11, 2015 2:12 pm Post subject: Primer bulb failure |
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Tried to start the FSII last week, the priming system was not priming, you can get an idea of how it is plumbed on this page: http://oh2fly.net/oldpoops/Fuel_tanks_storage.html
Primer bulb was not working, put in a new one and cut the old one in half with an X-acto knife. Very interesting: the inside was coming apart in strange ways. Note a couple little fragments of rubber right next to the ends where the check valves are. They are not a result of cutting the bulb apart, they were there and got discovered. Guaranteed to make the bulb not work right.
Don't remember how old this bulb is, but they obviously have a fairly short service life, probably ought to replace at annual.
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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williamtsullivan(at)att.n
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| Posted: Fri Dec 11, 2015 2:15 pm Post subject: Primer bulb failure |
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Alcohol doing something to it? Mine got really hard, and has to be replaced.
Bill Sullivan
"Richard Pike" <thegreybaron(at)charter.net>
Very interesting: the
inside was coming apart in strange ways. Note a couple
little fragments of rubber right next to the ends where the
check valves are. They are not a result of cutting the bulb
apart, they were there and got discovered.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=450892#450892
Attachments:
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http://forums.matronics.com//files/p1040824_medium_199.jpg
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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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| Posted: Fri Dec 11, 2015 2:54 pm Post subject: Primer bulb failure |
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Most bulbs are, as you describe, crap. I've had several that had to be taken apart from new in order to modify the check cage to secure the ball from falling out. And the bulb material will often disintegrate.
I look up these the same way I do toothbrushes. You know damned well there is a plastic bristle formulation that won't deform for years but the manufacturer prefers built-in obsolescence.
Jim Baker
405.426.5377
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baberdk
Joined: 23 Jan 2014
Posts: 53
Location: East Moline, Il
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| Posted: Sat Dec 12, 2015 5:20 am Post subject: Primer bulb failure |
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I put a small 7lb pressure metal 12v fuel pump in series between the filter and the stock fuel pump. A switch on the dash allows me to prime the system and then shut it off, but it will also run the engine if the stock fuel pump stops operating in case of flight emergency. I see no reason it can't take over if the stock check valve fails, or the stock pump or pulse line fails. I read that the fuel system is the number one cause of engine stoppage. Gasohol uses plant-based alcohol and it eats rubber. The pump I picked up at Autozone is made to run with gasohol, and doesn't restrict flow when shut off.Respectfully,
Dennis Baber
(305) 814-7218
baberdk(at)gmail.com (baberdk(at)gmail.com)
Receive gracefully and share; that's all there is.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Dec 12, 2015 6:48 am Post subject: Primer bulb failure |
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I'm a firm believer in auxiliary electric fuel pumps.
When you mention pulse line failure (I assume for a two stroke), I don't know how long that engine would run before it fails. A pulse line failure would normally open the crank case to the atmosphere.
Anyone experienced a pulse line failure in flight?
Another reason for me to run premium neoprene fuel line, rather than plastic "ultralight" tubing.
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Denny Baber
Sent: Saturday, December 12, 2015 7:20 AM
To: kolb-list(at)matronics.com
Subject: Re: Primer bulb failure
I put a small 7lb pressure metal 12v fuel pump in series between the filter and the stock fuel pump. A switch on the dash allows me to prime the system and then shut it off, but it will also run the engine if the stock fuel pump stops operating in case of flight emergency. I see no reason it can't take over if the stock check valve fails, or the stock pump or pulse line fails. I read that the fuel system is the number one cause of engine stoppage. Gasohol uses plant-based alcohol and it eats rubber. The pump I picked up at Autozone is made to run with gasohol, and doesn't restrict flow when shut off.
Respectfully,
Dennis Baber
(305) 814-7218
baberdk(at)gmail.com (baberdk(at)gmail.com)
Receive gracefully and share; that's all there is.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Dec 12, 2015 7:03 am Post subject: Primer bulb failure |
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Should have added the following to my comment below:
"I don't know how long the engine would run before it fails "with an auxiliary fuel pump".
john h
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of John Hauck
Sent: Saturday, December 12, 2015 8:48 AM
To: kolb-list(at)matronics.com
Subject: RE: Primer bulb failure
I'm a firm believer in auxiliary electric fuel pumps.
When you mention pulse line failure (I assume for a two stroke), I don't know how long that engine would run before it fails. A pulse line failure would normally open the crank case to the atmosphere.
Anyone experienced a pulse line failure in flight?
Another reason for me to run premium neoprene fuel line, rather than plastic "ultralight" tubing.
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server(at)matronics.com (owner-kolb-list-server(at)matronics.com) [mailto:owner-kolb-list-server(at)matronics.com (owner-kolb-list-server(at)matronics.com)] On Behalf Of Denny Baber
Sent: Saturday, December 12, 2015 7:20 AM
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Subject: Re: Primer bulb failure
I put a small 7lb pressure metal 12v fuel pump in series between the filter and the stock fuel pump. A switch on the dash allows me to prime the system and then shut it off, but it will also run the engine if the stock fuel pump stops operating in case of flight emergency. I see no reason it can't take over if the stock check valve fails, or the stock pump or pulse line fails. I read that the fuel system is the number one cause of engine stoppage. Gasohol uses plant-based alcohol and it eats rubber. The pump I picked up at Autozone is made to run with gasohol, and doesn't restrict flow when shut off.
Respectfully,
Dennis Baber
(305) 814-7218
baberdk(at)gmail.com (baberdk(at)gmail.com)
Receive gracefully and share; that's all there is.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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