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dbentley(at)fuse.net
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 Posted: Mon Oct 13, 2008 3:55 pm Post subject: Fuel Pump Problem |
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My RV6 has 350 hours on it, with Airflow Performance Fuel Injection. Lately I noticed an oil leak in the bottom of the cowl and after a lot a searching I found the mechanical fuel pump with oil dripping off the bottom. Several of the small screws on the bottom were loose, so I assumed an onset of a failure to the diaphragm and went to the local Aviall distributor and bought a rebuilt LW15473. It says it’s a “Tempest”. I installed it and started the engine. It keeps dying at idle.
The electrical fuel pump will keep it running showing fuel pressure of 28-30 psi, but when I switch it off, the pressure bleeds down to around 16 psi and then the engine quits. Same thing 3-4 times, even at higher throttle settings.
I pulled the pump off to verify that I had installed it correctly. The top of the pump arm has a shinny mark where the plunger from the accessory case is hitting it – dead center. I guess I go back to Aviall. Any other suggestions?
Duane Bentley
RV6 – N515DB
West Chester, OH
[quote][b]
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Gary.A.Sobek
Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA
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| Posted: Mon Oct 13, 2008 4:19 pm Post subject: Fuel Pump Problem |
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Several years ago C a friend of mine with a FI engine had the same problem with a Lycoming pump. The part number on the pump was correct but the pump that came out of the box was a different part number. It was for the 5 PSI carb.
It is possible that they put the WRONG pump in the correct box.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell C
2 C156+ Flying Hours So. CA C USA
From: dbentley(at)fuse.net
To: rv-list(at)matronics.com
Subject: Fuel Pump Problem
Date: Mon C 13 Oct 2008 19:53:37 -0400
My RV6 has 350 hours on it C with Airflow Performance Fuel Injection.
Lately I noticed an oil leak in the bottom of the cowl and after a lot a searching
I found the mechanical fuel pump with oil dripping off the bottom. Several
of the small screws on the bottom were loose C so I assumed an onset of a
failure to the diaphragm and went to the local Aviall distributor and bought a
rebuilt LW15473. It says it’s a “Tempest”. I
installed it and started the engine. It keeps dying at idle.
The electrical fuel pump will keep it running showing fuel
pressure of 28-30 psi C but when I switch it off C the pressure bleeds down to
around 16 psi and then the engine quits. Same thing 3-4 times C even at
higher throttle settings.
I pulled the pump off to verify that I had installed it
correctly. The top of the pump arm has a shinny mark where the plunger
from the accessory case is hitting it – dead center. I guess I go
back to Aviall. Any other suggestions?
Duane Bentley
RV6 – N515DB
West Chester C OH
_________________________________________________________________
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Mon Oct 13, 2008 7:23 pm Post subject: Fuel Pump Problem |
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Do you have a fuel pressure gauge? Odds are that you got the low
pressure pump for carburetors (5-7psi) vs the high pressure for FI that
puts out around 24 psi.
Duane Bentley wrote:
| Quote: |
My RV6 has 350 hours on it, with Airflow Performance Fuel Injection.
Lately I noticed an oil leak in the bottom of the cowl and after a lot
a searching I found the mechanical fuel pump with oil dripping off the
bottom. Several of the small screws on the bottom were loose, so I
assumed an onset of a failure to the diaphragm and went to the local
Aviall distributor and bought a rebuilt LW15473. It says it’s a
“Tempest”. I installed it and started the engine. It keeps dying at idle.
The electrical fuel pump will keep it running showing fuel pressure of
28-30 psi, but when I switch it off, the pressure bleeds down to
around 16 psi and then the engine quits. Same thing 3-4 times, even at
higher throttle settings.
I pulled the pump off to verify that I had installed it correctly. The
top of the pump arm has a shinny mark where the plunger from the
accessory case is hitting it – dead center. I guess I go back to
Aviall. Any other suggestions?
Duane Bentley
RV6 – N515DB
West Chester, OH
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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