fuel pressure control
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fuel pressure control
Hello all
a couple quick questions ( 1998 f 250 4 wheel drive 5.0
what controls the fuel pump, Im not getting any pressure at the rail. The filter is clean and the fuel pump turns on for a second and then turns right off .
Is there a fuel pump in the tanks (Its a duel tank truck,but i have the sanme problem on both tanks), so I dont think thats my problem.
I have change the fuel pump relay,fuel filter ,control mod that mounts on the side of the distributor,
Any ideas ???
thanks
wizzerds dad ( he has been posting questions also)
jeff
a couple quick questions ( 1998 f 250 4 wheel drive 5.0
what controls the fuel pump, Im not getting any pressure at the rail. The filter is clean and the fuel pump turns on for a second and then turns right off .
Is there a fuel pump in the tanks (Its a duel tank truck,but i have the sanme problem on both tanks), so I dont think thats my problem.
I have change the fuel pump relay,fuel filter ,control mod that mounts on the side of the distributor,
Any ideas ???
thanks
wizzerds dad ( he has been posting questions also)
jeff
New User
Joined: Jan 2009
Posts: 18
Likes: 0
From: Central Texas
Are you saying the fuel pump shuts off with the key on - engine off? If thats the case that is correct. It powers up the psi then shuts off. Engine on is a different story. You also mentioned everything but the fuel pressure regulator. On mine I pulled the vacuum tube off the top and it started up. Give it a whirl...might help.
Good luck.
http://www.aa1car.com/library/fuel_pump_diagnose.htm
here is a link that also might help...
Good luck.
http://www.aa1car.com/library/fuel_pump_diagnose.htm
here is a link that also might help...
Cargo Master
Joined: Apr 2003
Posts: 3,475
Likes: 224
From: Frequently frozen MN
When you turn the key to on , the PCM (computer) should run the fuel pump for 2 seconds. It won't run again until the PCM detects that the engine has started.
As far as I know Fords have a fuel pump in each tank. They used to have an additional high pressure pump on the rail, but now the tank pumps supply sufficient pressure.
I don't know where you're measuring the pressure. Traditionally, there was a Schrader valve ( similar to the valve on a tire) just before the Fuel Pressure Regulator.
The FPR is generally a diaphragm controlled by engine vacuum. These apparently do tear and leak fuel into the vacuum line.
fordfuelinjection.com is a good source for info.
As far as I know Fords have a fuel pump in each tank. They used to have an additional high pressure pump on the rail, but now the tank pumps supply sufficient pressure.
I don't know where you're measuring the pressure. Traditionally, there was a Schrader valve ( similar to the valve on a tire) just before the Fuel Pressure Regulator.
The FPR is generally a diaphragm controlled by engine vacuum. These apparently do tear and leak fuel into the vacuum line.
fordfuelinjection.com is a good source for info.
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