machinerguy
NAXJA Forum User
- Location
- Pittsburgh
95 4.0 aw4. This problem crept up on me and is getting worse. On initial startup when I turn the key to "Run", the fuel pump doesn't run. If I leave the key on for a few minutes, the "fuel pump" and "auto shutdown" relays begin to rattle as if they're not getting enough current to fully engage, then quiet down, and the fuel pump runs. I have to "poor man's prime" a couple of times, then the engine will start reluctantly.
I thought the problem was electrical so I :
Leapfrogged relays.
Put in new (used) fuel pump.
Cleaned big plug @ firewall behind fusebox.
Jumped 12v to plug from ignition switch.
Looked for wet spark plugs.
My fuel rail IS losing pressure.
The questions are;
Would a low pressure condition cause my electrical symptoms?
How do I know if it's losing pressure through the injectors or the regulator/check valve?
Am I overlooking something?
I thought the problem was electrical so I :
Leapfrogged relays.
Put in new (used) fuel pump.
Cleaned big plug @ firewall behind fusebox.
Jumped 12v to plug from ignition switch.
Looked for wet spark plugs.
My fuel rail IS losing pressure.
The questions are;
Would a low pressure condition cause my electrical symptoms?
How do I know if it's losing pressure through the injectors or the regulator/check valve?
Am I overlooking something?