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

 

or it could just be a bad pressure regulator. that could explain your "When I go ON three times, it starts for about 2 sec and dies" cycling the pump multiple times on may be building enough pressure to make it past the faulty regulator. or the same reason for suspecting a weak pump. but still no use in stabbing at faulty parts till you put a gauge on it.

 

Had it towed to the garage because the weather was bad and I was in a rush.

Faulty MAP sensor was the problem...