No start problem - fuel
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Joined: Jan 2004
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No start problem - fuel
1988, 5.0, A/T, 2WD
Progression of symptoms:
- Would run rough/miss for the first few minutes until warm
- Slight detonation under load
Now:
- Will not start in any condition (may half-start, but will stumble badly and stall out quickly)
- Fuel pressure around 10 psi at fuel rail schrader valve
- Will start smoothly with starter fluid, but will not continue to run
What's the best way to appraoch this from a troubleshooting standpoint? Fuel filter, then FPR, then external fuel pump? I hear the pump running when the key in on, and obviously I'm getting some pressure? Ideas?
Thanks!
Mike
Progression of symptoms:
- Would run rough/miss for the first few minutes until warm
- Slight detonation under load
Now:
- Will not start in any condition (may half-start, but will stumble badly and stall out quickly)
- Fuel pressure around 10 psi at fuel rail schrader valve
- Will start smoothly with starter fluid, but will not continue to run
What's the best way to appraoch this from a troubleshooting standpoint? Fuel filter, then FPR, then external fuel pump? I hear the pump running when the key in on, and obviously I'm getting some pressure? Ideas?
Thanks!
Mike
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
You say you hear the high pressure pump running.
So it would be the selector switch, fuel filter, bad in-tank pumps or the fuel selector valve.
Is the fuel pump running all the time the key is on?
Start by grounding pin #6 of the EEC self-test connector and then turn on the key.
This will allow the fuel pumps to run and not time out after one second.
Select each tank one at a time and listen each time at the fuel cap and see if you hear the pump run.
The EEC self-test connector:
http://i54.photobucket.com/albums/g9...onnectorFP.jpg
/
So it would be the selector switch, fuel filter, bad in-tank pumps or the fuel selector valve.
Is the fuel pump running all the time the key is on?
Start by grounding pin #6 of the EEC self-test connector and then turn on the key.
This will allow the fuel pumps to run and not time out after one second.
Select each tank one at a time and listen each time at the fuel cap and see if you hear the pump run.
The EEC self-test connector:
http://i54.photobucket.com/albums/g9...onnectorFP.jpg
/
