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06-29-2011, 09:57 PM
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Join Date: Aug 2008
Location: MONTGOMERY, TX.
Posts: 89
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fuel supply
Be sure the vents are open and face forward. 
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06-30-2011, 12:47 AM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by foka4
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.
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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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06-30-2011, 12:56 AM
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Join Date: May 2005
Location: Santa Barbara, CA
Posts: 1,324
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Quote:
Originally Posted by dougknight
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?
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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
FAAST Team Representative
EAA Flight Advisor
RV8 N18U "Sunshine"
KSBA
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06-30-2011, 09:25 AM
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Join Date: Feb 2008
Location: Oxnard CA
Posts: 52
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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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06-30-2011, 12:16 PM
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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.
__________________
Cary Rhodes
Taylorsville, Georgia
N203CR
Van's RV-7
First Flight April 2004
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07-03-2011, 01:20 PM
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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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07-03-2011, 01:42 PM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by gasman
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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I have 2 electric pumps and the mechanical pump. No shortage of fuel pressure here. 
__________________
RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
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07-04-2011, 06:54 AM
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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.
__________________
RV4 IO-320, Catto 3-blade, Christen, I-BILT
Flight time: 1 hour
Status: test flights
www.rv4.it
ROME, Italy
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RV9A O-320 D1A, Hartzell C/S prop, slider, I-PRCA
Flight time: 350 hours
Status: SOLD
http://nuke.rv9.it
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07-04-2011, 02:02 PM
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Join Date: Feb 2006
Posts: 72
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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.
__________________
Joe Ramotowski
RV9 sold!
RV8 Flying
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