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  #21  
Old 06-29-2011, 09:57 PM
DENMACRES DENMACRES is offline
 
Join Date: Aug 2008
Location: MONTGOMERY, TX.
Posts: 89
Default fuel supply

Be sure the vents are open and face forward.
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  #22  
Old 06-30-2011, 12:47 AM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
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Quote:
Originally Posted by foka4 View Post
As a precaution, I now run the Facet pump all the time. If it ever wears out, I'll buy another one. It's cheap insurance in my book.
Most all modern autos run electric fuel pumps 100,000 miles (about 2500 hours) with no problem. My next project will have two electric fuel pumps. A main that will run all the time, and a back-up. No mechanical pump.
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  #23  
Old 06-30-2011, 12:56 AM
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John Clark John Clark is offline
 
Join Date: May 2005
Location: Santa Barbara, CA
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Quote:
Originally Posted by dougknight View Post
I have wondered about the facet pump if it could somehow cause a restrictsion when it is off? Any body ever found this to be a problem?
I had a Facet pump that would make pressure when on but restrict flow when switched off. It was in a car, but that doesn't really matter. I would check the pump and make sure that it flows fuel when "off" and is correct for the application. Facet makes dozens of different models that look alike, some including check valves that could stick.

John Clark ATP, CFI
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RV8 N18U "Sunshine"
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  #24  
Old 06-30-2011, 09:25 AM
DonMcMullen DonMcMullen is offline
 
Join Date: Feb 2008
Location: Oxnard CA
Posts: 52
Default Low fuel pressure

All those suggestions are great. I also had the problem of low mechanical fuel pump pressure. My engine never quit but I was sure concerned with the low .5 pressure. I lowered my fuel breather intakes just a tad more into the wind stream and the pressure came up to 1 just enough to make me feel better. I never had a problem though. I don't put screens in the vents for fear of ice build up when flying in clouds.
That's my 2 cents
Don
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  #25  
Old 06-30-2011, 12:16 PM
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caryr caryr is offline
 
Join Date: Jan 2005
Location: northwest georgia
Posts: 315
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There is a screen on the suction side of the little Facet pump.

I had some trash there one time and severely restricted the fuel flow.
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  #26  
Old 07-03-2011, 01:20 PM
DSmith DSmith is offline
 
Join Date: Feb 2006
Location: Panama City Beach, FL
Posts: 129
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My money is on the mechanical pump pulling air into the system through the gascolator. There's not much else that could cause this.
Danny
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  #27  
Old 07-03-2011, 01:42 PM
David-aviator David-aviator is offline
 
Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by gasman View Post
Most all modern autos run electric fuel pumps 100,000 miles (about 2500 hours) with no problem. My next project will have two electric fuel pumps. A main that will run all the time, and a back-up. No mechanical pump.
I have 2 electric pumps and the mechanical pump. No shortage of fuel pressure here.
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  #28  
Old 07-04-2011, 06:54 AM
Camillo Camillo is offline
 
Join Date: Sep 2006
Location: Roma, Italy
Posts: 510
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I have a carbureted RV9A and fuel pressure is between 3 and 5 PSI. Very often before take-off is 4.9 and when I switch the pump on it remains at 4.9. Never came down, neither in flight, under 2 PSI.

I will try to disconnect the fuel hose enetering into the caruretor and perform the fuel check with the electric pump on. This will at least exclude you have some restriction in the line.
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  #29  
Old 07-04-2011, 02:02 PM
Joerpilot Joerpilot is offline
 
Join Date: Feb 2006
Posts: 72
Default Fuel pressure

I had a similar problem on my 0320. Replaced the boost pump, same problem; replaced the carburator, same problem. Finally replaced engine driven fuel pump (pain in the @&$&!). Problem solved! Just my experience. Yours may be different. Good luck, it's no fun when the RPM starts to follow the fuel pressure down.
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