Code 41 and looses fuel pressure
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New User
Joined: Mar 2011
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From: Milwaukie, OR
Code 41 and looses fuel pressure
I have a 1992 7.5 F250 with 65K and am getting a code #41, my mileage is about 7-8 and it feels like it runs a little rich but isn't horrible. I've replaced the fuel filter which was pretty dirty when I cut it open, replaced the FPR and replaced the injectors with rebuilt ones. When I put a fuel pressure gauge on using the front tank it will build to 38# but then drop to 0 in about 30 seconds.
When I test on the rear tank pressure will only build for as long as the pump is running which is about 10# and then drop off instantly.
Is there a relief valve or something keeping me from building and keeping pressure or both pumps bad???
When I test on the rear tank pressure will only build for as long as the pump is running which is about 10# and then drop off instantly.
Is there a relief valve or something keeping me from building and keeping pressure or both pumps bad???
Post Fiend
Joined: Feb 2009
Posts: 8,773
Likes: 1
From: Texas Coast
You could have a issue with the FPR or a vacuum leak that is effecting it. Fouled pumps or lines or the recall.
RECALL NUMBER: 93S68
TO: All Ford Dealers
SUBJECT:
Safety Recall 93S68 - All 1990, 1991, 1992 and certain 1993 Model Year F-Series Vehicles equipped with 4.9, 5.0, 5.8 or 7.5 Liter
REASONS FOR RECALL
Some of the affected vehicles may experience a cross tank fuel flow condition due to a damaged check valve in the fuel pump/sender assembly. Fuel may be supplied from one tank and some or all of the unused fuel may be returned to the other tank. Should this occur, the capacity of the receiving tank may be exceeded and fuel may overflow from the filler cap. Fuel spillage in the presence of an ignition source could potentially result in a fire.
To correct this condition, the fuel pressure regulator will be replaced and a check valve will be installed between each fuel supply line and fuel tank.
RECALL NUMBER: 93S68
TO: All Ford Dealers
SUBJECT:
Safety Recall 93S68 - All 1990, 1991, 1992 and certain 1993 Model Year F-Series Vehicles equipped with 4.9, 5.0, 5.8 or 7.5 Liter
REASONS FOR RECALL
Some of the affected vehicles may experience a cross tank fuel flow condition due to a damaged check valve in the fuel pump/sender assembly. Fuel may be supplied from one tank and some or all of the unused fuel may be returned to the other tank. Should this occur, the capacity of the receiving tank may be exceeded and fuel may overflow from the filler cap. Fuel spillage in the presence of an ignition source could potentially result in a fire.
To correct this condition, the fuel pressure regulator will be replaced and a check valve will be installed between each fuel supply line and fuel tank.
Thread Starter
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New User
Joined: Mar 2011
Posts: 12
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From: Milwaukie, OR
I'm not having trouble with one tank filling another but I'll check for vac leaks some more. It seems wierd that the tanks would bleed off at different rates but I'll look into a exchanging my FPR. I really don't want to keep throwing parts at it and have my good deal on a low mile truck turn into a money pit.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
To me it sounds like you do have a check valve problem, the other main cause of this is a leaking injector but you have already changed them out so that only leaves one option and it sounds like your rear FDM has problems anyway so that's the one I'd change first.
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