Fuel Pressure Issue
Thread Starter
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Junior User
Joined: Apr 2004
Posts: 74
Likes: 0
Fuel Pressure Issue
1987 302 EFI
Ok ok, I really need help here. My van as to run in 2 weeks.
Here's the other topic explaining my problems so far:
https://www.ford-trucks.com/forums/showthread.php?t=3152...ad.php?t=315230 (posted in november)
What I did today: removed the doghouse to acess the fuel rail.
Key ON: fuel bursting out of the fuel pressure check valve then stops. I gess the electric pump builds up the pressure to start. I also gess that when you crank and start, it runs constantly.
Key ON once, doesn't start (but crank all right). Key ON, OFF, ON, cranks almost starts, burns something. When I go ON three times, it starts for about 2 sec and dies. Same scenario on both thanks.
I crawled under it. My friend was operating the key. Key ON on front tank: bzzz and click in the front tank. Switch to rear, key ON on rear tank, bzzz and click.
It doesn't run on either tanks. Looks like I need to build some pressure to get it to run.
My gess:
- Electric pump weak close to death
or
- Tank switch box improperly working.
I still need to find a fuel pressure gage.
Is the electric pump working constantly when you crank the engine?
Thanks for your help.
Etienne
<!-- / message -->
Ok ok, I really need help here. My van as to run in 2 weeks.
Here's the other topic explaining my problems so far:
https://www.ford-trucks.com/forums/showthread.php?t=3152...ad.php?t=315230 (posted in november)
What I did today: removed the doghouse to acess the fuel rail.
Key ON: fuel bursting out of the fuel pressure check valve then stops. I gess the electric pump builds up the pressure to start. I also gess that when you crank and start, it runs constantly.
Key ON once, doesn't start (but crank all right). Key ON, OFF, ON, cranks almost starts, burns something. When I go ON three times, it starts for about 2 sec and dies. Same scenario on both thanks.
I crawled under it. My friend was operating the key. Key ON on front tank: bzzz and click in the front tank. Switch to rear, key ON on rear tank, bzzz and click.
It doesn't run on either tanks. Looks like I need to build some pressure to get it to run.
My gess:
- Electric pump weak close to death
or
- Tank switch box improperly working.
I still need to find a fuel pressure gage.
Is the electric pump working constantly when you crank the engine?
Thanks for your help.
Etienne
<!-- / message -->
Thread Starter
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Junior User
Joined: Apr 2004
Posts: 74
Likes: 0
Ignition module is beyond my knowledge... can you help me with that?
Yeah I know where the fuel pump is, but it's expensive, is there any way I can make sure it's not working properly?
Thanks for your help!
Yeah I know where the fuel pump is, but it's expensive, is there any way I can make sure it's not working properly?
Thanks for your help!
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Spend the $40 and get a fuel pressure tester. It is a vital tool for diagnosing any fuel problems on an EFI vehicle. If you have about 10-15psi, the frame pump is bad OR the regulator is stuck open. If you have the return line off and the fuel is pouring out of the regulator, then you've found the problem.
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