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capt_riney(at)yahoo.com
Guest

Posted: Wed Jan 13, 2010 9:07 am Post subject: 582 fuel system

I've got a series or parallel question about installing a facet boost pump.  I'm planning on intalling a facet pump between my fuel tank and the he mikuni engine pump. I'm doing it in series just to keep it simple.  If the facet fails it should still flow thru so the mikuni will be able to draw fuel from the tank.  But what if the mikuni fails? Will it flow thru and allow the boost pump fuel to get to the carbs?  Those of you with similar systems I'd appreciate your advice. 



Mark Rinehart

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Jan 13, 2010 10:05 am Post subject: 582 fuel system

> I've got a series or parallel question about installing a facet boost 

pump.  I'm planning on intalling a facet pump between my fuel tank and the 

he mikuni engine pump. I'm doing it in series just to keep it simple.  If 

the facet fails it should still flow thru so the mikuni will be able to draw 

fuel from the tank.  But what if the mikuni fails? Will it flow thru and 

allow the boost pump fuel to get to the carbs?  Those of you with similar 

systems I'd appreciate your advice.

 	  Quote: 	
		  

 Mark Rinehart


	




Mike R/Gang:



You'll get all kinds of responses to this one.



I started using two mikuni fuel pumps on my first Kolb, an Ultrastar.  The 

Cuyuna ULII02 had two crank case pressure ports, one for each cylinder.  I 

ran the Mikunis, one off each port, in series.



Used a back up Facet Electronic boost pump in my 447 powered Firestar 

plumbed in series with excellent results.  The Mikuni pulled fuel through 

the Facet when the Facet was shut down, normally at all times except during 

take off, landing, and low level flight.



For the last 3,000 hours (minus 12) I have used a Facet and Mikuni or engine 

driven pump plumbed in series on my MKIII with no problems encountered.



Usually, if  a Mikuni pulse pump fails, it will be one of two little ears on 

the diaphragm that serve as the intake and outlet valves.  I know of no 

Mikuni diaphragm that has failed to allow fuel to be pumped through it and 

outside the pump.



I like the fuel pump plumbed in series.  Works for me.



You'll have to choose which way you want to go.



john h

mkIII

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

tclongo(at)att.net
Guest

Posted: Wed Jan 13, 2010 10:11 am Post subject: 582 fuel system

Yes it will, the Mikuni will flow through if it fails to pump also and let

the boost pump keep you flying.  



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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Wed Jan 13, 2010 10:20 am Post subject: 582 fuel system

At 12:05 PM 1/13/2010, mark rinehart wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: mark rinehart <capt_riney(at)yahoo.com>



 I've got a series or parallel question about installing a facet boost pump.  I'm planning on intalling a facet pump between my fuel tank and the he mikuni engine pump. I'm doing it in series just to keep it simple.  If the facet fails it should still flow thru so the mikuni will be able to draw fuel from the tank.  But what if the mikuni fails? Will it flow thru and allow the boost pump fuel to get to the carbs?  Those of you with similar systems I'd appreciate your advice. 	


 If the Mikuni pump's check valves fail, the boost pump will pump fuel through the pump and keep the engine running.  OTOH, if the Mikuni's diaphragm fails, the boost pump will pump fuel back up the pulse line and fill the crankcase.



 -Dana

 --

  No trees were harmed in the transmission of this message. However, a rather large number of electrons were temporarily inconvenienced.    [quote][b]

mdnanwelch7(at)hotmail.co
Guest

Posted: Wed Jan 13, 2010 11:09 am Post subject: 582 fuel system

Mark and Kolb guys C

  

   I'm curious.  I don't have much experience with diaphram pumps and all C but it seems odd to want to design a series fuel pumping system.  I mean C I know a series system would work great and all....but how would you know you lost one of the pumps C if the other pump can do all the work? 

   Let's say C for example C the last flight you had C your primary pump blew out C and the backup kept you flying C how would you know???  You'd be toolin' along thinking you had both pumpers up to snuff C but you wouldn't.

  

   Unless you verified each and every flight that BOTH pumps were operating fine C you could be relying a false sense of security.  Wouldn't you?

  

   If it were me C and maybe that's just my way of thinking C I think I would like a parallel fuel system.  Here why I think this;  if my primary system failed C it would kick on the backup system (and a big bright red panel light).  The light would alert me that the primary pump needs attention C and when I landed C I could take care of the problem C but in the meantime C my backup is doing it's job.

  

   For a parallel design C a primary system could easily have a low-pressure switch ($30 McMaster Carr) that if activated (due to a zero or very low fuel pressure) C it would turn on the backup pump.

   This method is close to how my turbo "high fuel delivery" fuel system is designed and operated.

  

   I realize a series fuel system C with two fuel pumps C CAN work.  I know that.  But C how would you know that every flight both are working properly?

  

   Just some thoughts on the matter.......

  

 Mike Welch

 MkIII CX

 

[quote] I've got a series or parallel question about installing a facet boost pump. I'm planning on intalling a facet pump between my fuel tank and the he mikuni engine pump. I'm doing it in series just to keep it simple. If the facet fails it should still flow thru so the mikuni will be able to draw fuel from the tank. But what if the mikuni fails? Will it flow thru and allow the boost pump fuel to get to the carbs? Those of you with similar systems I'd appreciate your advice. 

 

 Mark Rinehart

 		 	   		  Hotmail: Free C trusted and r01/' target='_new'>Get it now.   	  Quote: 	
		  [b]

NeilsenRM(at)comcast.net
Guest

Posted: Wed Jan 13, 2010 12:13 pm Post subject: 582 fuel system

Mike

  

 Your system sounds great and should work well but I like  to keep things simple.

  

 My fuel system requires a electric fuel pump. I  have two electric pumps in series, one is driven by the ignition  circuit. The secondary pump by separate switched circuit. My starting routine is  prime the fuel system using the back up pump. I watch the fuel flow through a  short piece of transparent fuel line till the float bowls are full. I then turn  off the secondary system and start the engine. I can see fuel flow and hear  the faucet pump running when I turn on the back up pump. I know the back up  pump test works because the faucet pump died a few years  back and its need for replacement was very noticeable.  I can  hear the primary pump running when the ignition is turned on. I also know  if the primary pump fails the engine will quit fairly quick and while still  on the ground. I had to disconnect the primary pump power wires to test this.  Before takeoff or landing I turn on the back up pump.

  

 It works for me.

  

 Rick Neilsen

 Redrive VW Powered MKIIIC

   

 [quote]   ---

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Wed Jan 13, 2010 12:39 pm Post subject: Re: 582 fuel system

 	  capt_riney(at)yahoo.com wrote: 	
		  I've got a series or parallel question about installing a facet boost pump.  I'm planning on intalling a facet pump between my fuel tank and the he mikuni engine pump. I'm doing it in series just to keep it simple.  If the facet fails it should still flow thru so the mikuni will be able to draw fuel from the tank.  But what if the mikuni fails? Will it flow thru and allow the boost pump fuel to get to the carbs?  Those of you with similar systems I'd appreciate your advice. 



Mark Rinehart 	




There's generally little advantage to adding the electric pump and a couple of disadvantages. The mikuni pneumatic pumps are exceedingly reliable and, in a Kolb installation, provide plenty of vacuum to draw the fuel up from the tank to the engine.



The primary disadvantages are, in my view, enough to decide against adding the boost pump:

- the electric pumps add a small amount of drag when off from the check valve.

- additional complexity is added in the form of the electrics, the switch, the additional procedures to follow for its use.

- more troubleshooting needed when there is a fuel draw problem, as you've already pretty much correctly alluded to here .



As I said, the pneumatic pumps are exceptionally reliable and when simply used by themselves yeild the simplest and easy to use/maintain system. I've used them for years and many hundreds of hours and have never had one fail.



LS

_________________
LS
Titan II SS

mdnanwelch7(at)hotmail.co
Guest

Posted: Wed Jan 13, 2010 1:34 pm Post subject: 582 fuel system

Rick N. C

  

   The design of your system sounds like I was asking about.  Your ability to verify each pump C prior to each flight C is the kind of assure I was wondering about.  It appears as though you have everything covered.

  

  But C Rick C is your fuel delivery a true "series" design?

  

 Mike Welch

 

  From: NeilsenRM(at)comcast.net

To: kolb-list(at)matronics.com

Subject: Re: 582 fuel system

Date: Wed C 13 Jan 2010 15:12:13 -0500



  .ExternalClass .ecxhmmessage P {padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;} .ExternalClass BODY.ecxhmmessage {font-family:Verdana;font-size:10pt;}   Mike

  

 Your system sounds great and should work well but I like to keep things simple.

  

 My fuel system requires a electric fuel pump. I have two electric pumps in series C one is driven by the ignition circuit. The secondary pump by separate switched circuit. My starting routine is prime the fuel system using the back up pump. I watch the fuel flow through a short piece of transparent fuel line till the float bowls are full. I then turn off the secondary system and start the engine. I can see fuel flow and hear the faucet pump running when I turn on the back up pump. I know the back up pump test works because the faucet pump died a few years back and its need for replacement was very noticeable.  I can hear the primary pump running when the ignition is turned on. I also know if the primary pump fails the engine will quit fairly quick and while still on the ground. I had to disconnect the primary pump power wires to test this. Before takeoff or landing I turn on the back up pump.

  

 It works for me.

  

 Rick Neilsen

 Redrive VW Powered MKIIIC

   

 [quote] ---

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Jan 13, 2010 1:47 pm Post subject: 582 fuel system

Mike, Richard, et al, I run a Facet in parallel in both my aircraft. I know it's running when I turn it on before start up by its thumping. I turn it off to taxi and if the engine dies I know I have a problem with the pneumatic pump. Once I do a runup and check the mags, I turn the Facet back on for take off. When I reach my cruising altitude I turn it off until I'm back in the pattern. I turn it on again for landing. If I'm just staying in the pattern I leave it on. Never had a problem with either aircraft. 



Rick Girard



On Wed, Jan 13, 2010 at 3:29 PM, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:

[quote]      Rick N.,

  

   The design of your system sounds like I was asking about.  Your ability to verify each pump, prior to each flight, is the kind of assure I was wondering about.  It appears as though you have everything covered.

  

  But, Rick, is your fuel delivery a true "series" design?

  

 Mike Welch

 

  From: NeilsenRM(at)comcast.net (NeilsenRM(at)comcast.net)

To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)

Subject: Re: 582 fuel system

 Date: Wed, 13 Jan 2010 15:12:13 -0500



   Mike

  

 Your system sounds great and should work well but I like to keep things simple.

  

 My fuel system requires a electric fuel pump. I have two electric pumps in series, one is driven by the ignition circuit. The secondary pump by separate switched circuit. My starting routine is prime the fuel system using the back up pump. I watch the fuel flow through a short piece of transparent fuel line till the float bowls are full. I then turn off the secondary system and start the engine. I can see fuel flow and hear the faucet pump running when I turn on the back up pump. I know the back up pump test works because the faucet pump died a few years back and its need for replacement was very noticeable.  I can hear the primary pump running when the ignition is turned on. I also know if the primary pump fails the engine will quit fairly quick and while still on the ground. I had to disconnect the primary pump power wires to test this. Before takeoff or landing I turn on the back up pump.

   

 It works for me.

  

 Rick Neilsen

 Redrive VW Powered MKIIIC

   

 [quote] ---

_________________
The smallest miracle right in front of you is enough to make you happy....

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Jan 13, 2010 2:00 pm Post subject: 582 fuel system

Mike W/Gang:

  

 We used standby fuel pumps in series with the main  pumps on UH-1 and AH-1 helicopters, when I was flying them a few years ago, like  35 years ago.

  

 We checked both during engine start and run  up.  We left the standby pump off and started the engine on the main fuel  pump.  Noting the fuel pressure on the main, we then turned on the  standby.  Usually, we would get a couple pound increase in pressure to let  us know the standby was operational.  The fact that the engine started and  was running on the main fuel told us it was operational.

  

 My MKIII is plumbed the same way as the Hueys and  Cobras, minus the fuel pressure gauge.  Before engine start I turn on the  Facet boost pump to prime the carbs.  I can listen to it and tell when the  bowls are full.  Turn it off and crank the engine with the engine driven  pump.  If the engine runs on the engine driven pump while I am getting  ready to taxi and takeoff, I am happy with it.  To be more exact, I should  have a fuel pressure gauge, but I don't like running a fuel line to the  instrument panel.

  

 john h

 mkIII 

  

  

 [quote]      I realize a series fuel    system, with two fuel pumps, CAN work.  I know that.  But, how    would you know that every flight both are working    properly?

 

  Just some thoughts on the    matter.......

 

Mike Welch

 

[b]

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Jan 13, 2010 2:49 pm Post subject: 582 fuel system

> There's generally little advantage to adding the electric pump and a 

couple of disadvantages. The mikuni pneumatic pumps are exceedingly reliable 

and, in a Kolb installation, provide plenty of vacuum to draw the fuel up 

from the tank to the engine.

 	  Quote: 	
		  

 As I said, the pneumatic pumps are exceptionally reliable and when simply 

 used by themselves yeild the simplest and easy to use/maintain system. 

 I've used them for years and many hundreds of hours and have never had one 

 fail.



 LS


	




Lucien/Gang:



I think the major advantage of having an electric boost pump is when the 

Mikuni fails, gives you another chance.



Back in my two stroke days I had a Mikuni fail.  Had a cheap Facet copy I 

bought from JC Whitney for backup pump, which failed a few hours after I 

departed Alabama for the Flight Farm, in Monterey, NY, in 1989.  The Mikuni 

failed while flying low level around the Flight Farm a few days later. 

Lucked out and landed in one of the many hay fields in the area.  Murphy 

knows when to strike.  He is very patient.



Might be complex for some, but pretty simple for most to cut a fuel line, 

stick a Facet in there, run a couple wires to the battery and a switch.  On 

my Firestar, I did not have a battery.  Connected the pump through a switch 

to my 12VDC buss.  Got a Facet to replace the Chinamanese pump when I got 

back to Alabama.  Trying to save a few dollars cost me a forced landing.



Not much maintenance to a Facet pump.  I have had one in my MKIII for a few 

hours less than 3,000.  Haven't done anything to it since installation in 

1991.



These pumps were used as primary lift pumps in many small pickup trucks, 

Mazda for one.  They have a great track record.  Almost as good as Mikuni.



My first little Kubota diesel was built in and around 1975.  It uses a 

Mikuni pulse pump for a lift pump.  It has several thousand hours and 35 

years of pumping without failure.  If that pump was in my airplane, it would 

probably fail next flight.  



john h

mkIII

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Wed Jan 13, 2010 3:56 pm Post subject: Re: 582 fuel system

 	  John Hauck wrote: 	
		  

Lucien/Gang:



I think the major advantage of having an electric boost pump is when the 

Mikuni fails, gives you another chance.



	




Seems like we've kicked around the electric fuel pump issue in the past, but my memory is a little foggy on it.



To the OP I'd say it's ultimately a matter of personal preference as my reasons for not liking and thus not using an electric pump (unless it's specifically called for by the installation) tend to be just matters of my own personal opinion and not really things I can substantiate with failure rates etc.



I personally prefer the simplest possible systems in critical areas like fuel systems because they're easier to maintain, less stuff for me to worry about in flight, easier to catch goofs on and yeild the simplest possible checklists in the plane. I.e.

fan stops turning:

- go to landing spot

- land

fan gets rough

- go to landing spot

- land



without having to hit extra switches, etc. 



etc...



Though I will admit that some of the terrain I've flown over in a couple of my recent trips did once or twice cause backup systems like an aux. fuel pump to pop into my mind for a moment. 

It did prompt me to go hug a road, which did quite enjoyably extend a flight I made the other day. 

If the WX is good this weekend I'm going to repeat it but this time using that new route with the road under it  That's the nice thing about our plane types being slower than the big iron - we get to spend more time in the plane on a trip.

LS

_________________
LS
Titan II SS

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Jan 13, 2010 4:28 pm Post subject: 582 fuel system

> Though I will admit that some of the terrain I've flown over in a couple 

of my recent trips did once or twice cause backup systems like an aux. fuel 

pump to pop into my mind for a moment.

 	  Quote: 	
		   It did prompt me to go hug a road, which did quite enjoyable extend a 

 flight I made the other day.

 If the WX is good this weekend I'm going to repeat it but this time using 

 that new route with the road under it 



 LS


	




Lucien/Gang:



Based on altitude and terrain, I will turn on the boost pump is necessary. 

The Facet is rated for continuous duty.  Could leave it on all the time.



If I am scared the engine is going to stop at any moment, I'll follow a road 

or other suitable forced landing area, if there is one.



Normally, flying with a 912UL or a 912ULS, I fly direct.



Aren't you flying a Titan with 912?



john h

mkIII

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

NeilsenRM(at)comcast.net
Guest

Posted: Wed Jan 13, 2010 8:43 pm Post subject: 582 fuel system

Mike

  

 Yes the system is true "series" design.

  

 Rick Neilsen

 Redrive VW Powered MKIIIC

 [quote]   ---

mdnanwelch7(at)hotmail.co
Guest

Posted: Wed Jan 13, 2010 9:01 pm Post subject: 582 fuel system

Rick C Rick C John C Lucien C etc C and others C

  

   Like I said C I don't know much about the 582 delivery systems C but it sounds like you guys have it figured out.

  

   My concern was not knowing if you had a failure in a two pump system C but as long as you can easily verify each pump is working properly C then it sounds like you're in good shape. 

  

 Mike Welch

 

 

  From: NeilsenRM(at)comcast.net

To: kolb-list(at)matronics.com

Subject: Re: 582 fuel system

Date: Wed C 13 Jan 2010 23:41:00 -0500



  .ExternalClass .ecxhmmessage P {padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;} .ExternalClass BODY.ecxhmmessage {font-family:Verdana;font-size:10pt;}   Mike

  

 Yes the system is true "series" design.

  

 Rick Neilsen

 Redrive VW Powered MKIIIC

 [quote] ---

Richard Pike

Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee

Posted: Thu Jan 14, 2010 4:33 am Post subject: Re: 582 fuel system

 	  John Hauck wrote: 	
		  

Lucien/Gang:



Based on altitude and terrain, I will turn on the boost pump as necessary. 

The Facet is rated for continuous duty.  Could leave it on all the time.

<snip>

john h

mkIII 	




That's what I do. There is a pressure gauge plumbed into the line between the Facet and the Mikuni, and if the engine burps and the pressure gauge is still at 3 psi, at least I know it's not fuel related.



Richard Pike

MKIII N420P (420ldPoops)

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Thu Jan 14, 2010 5:33 am Post subject: Re: 582 fuel system

 	  John Hauck wrote: 	
		  

Lucien/Gang:



Based on altitude and terrain, I will turn on the boost pump is necessary. 

The Facet is rated for continuous duty.  Could leave it on all the time.



If I am scared the engine is going to stop at any moment, I'll follow a road 

or other suitable forced landing area, if there is one.



Normally, flying with a 912UL or a 912ULS, I fly direct.



Aren't you flying a Titan with 912?



john h

mkIII 	




Yes, a II SS with a 912ULS. So far it's been 100% reliable but I'm still nervous about trusting my life to an engine. My plane and my ticket I'm not too worried about but not even my mighty 912ULS is completely comforting when I put myself over possibly life-threatening terrain.



But on some of my recent trips here in northern NM, you don't have much choice to get some places. Even going to Taos from SF there're a couple spots where you know it would just hurt if the fan stopped turning even if you hug roads and landing spots.



If the weekend is nice I'm going to try Questa (N24) and carry my trusty gas can along with.  I'll again go over some of that terrain on that trip.



Speaking of the facet pump, the other titan on our field uses one for his 7gal pony tank that he puts in the back seat. I'm experimenting with the gas can idea and it works well so far, but I'm thinking of trying the pony tank idea as well for longer legs. 

With my powerfin prop and slightly slower speed my fuel burn has dropped to right at 3gph - a 10 gal pony tank could extend my endurance to over 4 hours..



LS

_________________
LS
Titan II SS

slyck(at)frontiernet.net
Guest

Posted: Thu Jan 14, 2010 6:11 am Post subject: 582 fuel system

Lucien, too much logic and rational thinking will spoil a perfectly good flight.  

BB

do not archive

On 14, Jan 2010, at 8:34 AM, lucien wrote:

 	  Quote: 	

 John Hauck wrote:

> 

> Lucien/Gang:

> 

> Based on altitude and terrain, I will turn on the boost pump is necessary. 

> The Facet is rated for continuous duty.  Could leave it on all the time.

> 

> If I am scared the engine is going to stop at any moment, I'll follow a road 

> or other suitable forced landing area, if there is one.

> 

> Normally, flying with a 912UL or a 912ULS, I fly direct.

> 

> Aren't you flying a Titan with 912?

> 

> john h

> mkIII

 Yes, a II SS with a 912ULS. So far it's been 100% reliable but I'm still nervous about trusting my life to an engine. My plane and my ticket I'm not too worried about but not even my mighty 912ULS is completely comforting when I put myself over possibly life-threatening terrain.

 But on some of my recent trips here in northern NM, you don't have much choice to get some places. Even going to Taos from SF there're a couple spots where you know it would just hurt if the fan stopped turning even if you hug roads and landing spots.

 If the weekend is nice I'm going to try Questa (N24) and carry my trusty gas can along with. 

 Speaking of the facet pump, the other titan on our field uses one for his 7gal pony tank that he puts in the back seat. I'm experimenting with the gas can idea and it works well so far, but I'm thinking of trying the pony tank idea as well for longer legs.

 LS

 --------

 LS

 Titan II SS

 Read this topic online here:

 http://forums.matronics.com/viewtopic.php?p 81409#281409

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Thu Jan 14, 2010 6:26 am Post subject: Re: 582 fuel system

 	  slyck(at)frontiernet.net wrote: 	
		  Lucien, too much logic and rational thinking will spoil a perfectly good flight.  

BB

do not archive



On 14, Jan 2010, at 8:34 AM, lucien wrote:



	
 



Good point - That's why I like to fiddle with things in the plane as little as possible (my original point about the fuel pump) .



However, terrain awareness is a matter of basic training and safety, not too much rational thinking, etc. But that's just how I was trained - YMMV. Years later I can still hear the CFI's voice in my head on this ("solid gold plan B" and "skin, tin, ticket" were his mantras ). 



In fact, I've rediscovered the fun of navigating with a chart and pilotage instead of relying on the GPS. I flew down south to Belen, NM a few weeks ago and that trip is actually a little bit technical. You have the Albuquerque class C and the Double Eagle class D's to deal with. I'm transponder-less so I went around the ABQ class C using only the chart and landmarks to navigate my way to the destination.



I'd forgotten how enjoyable it is to do a trip the "old-fashioned-way" like that. I did cheat a little with the GPS as I approached the Belen airport, but otherwise I did it completely with the altimeter and the sectional, two practically fail-safe navigation aids.



And never had to flddle with a fuel pump switch the whole way there and back. 



LS

_________________
LS
Titan II SS

lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Thu Jan 14, 2010 6:43 am Post subject: 582 fuel system

We of course have had this discussion almost as many time  as Sea Foam, and I generally keep out of it, but I am wondering why do most of  you feel the facet is only useable as a boost pump? I know that in a GA plane,  they use a boost pump on take off and landing. I suppose that there is a reason  for that, but I can think of no reason why the facet (rated at 3-5 lbs of  pressure) has to be turned off when I am flying level? It certainly is not going  to over power the mech. pump. I only have about 500 hours on my plane, and when  I leave the airstrip almost no where that I could put down is a "good place". I  am sure that the mech. pump on the HKS could supply me enough fuel to limp to  somewhere better, but I can find no reason to spare the facet the function that  it was designed for. Will I use less gas if I leave it off? At $28.00 I am  pretty sure I could afford another one if this one went belly up. Don't get me  wrong, it really doesn't matter if you turn it off after you get airborne, I am  just curious as to why that is necessary.

  

 Larry, (forgetful but honest, even on a short winter  day)

  

  

 Note: If you forward this email, please delete the forwarding history,  which includes my email address.

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