So i have a 91 pickup with a 3.sl0w...well i had parked the truck for a while, when i stripped the nuts off of the fuel filter...and had to replace my lines, both from the tank to the main line...but i stripped that one too...so i had to remove the I.M. to replace the main fuel line to the fuel rail...now that i had fixed the lines and got everything back in its place....my starter went out...so i replaced it...and yesterday...the engine turned...but it tries to stay on...theres fire...and fuel coming in...and it just turns and turns and acts like it wants to start...but it seems to me like the fuel is being cut out once it starts...which leads me to think that the Circuit opening relay is the problem...since it controls both the injectors and fuel pump...any guidance i would appreciate

 

Diagnosing the COR is the easiest thing possible on this truck. Bypass the COR (and the VAF that controls it) by jumpering FP to B+ on the diagnostic connector. If that "clears up" your problem, you know you need to work on the VAF-COR circuit.

Don't just drive around with the jumper in. If you get in an accident that breaks a fuel line, you sure don' t want the fuel pump to keep running!

 

AWESOME!! i appreciate that...i will update tomorrow...will check later once off of work...

 

So i did the bypass of the COR and nothing same problem...i heard the pump cut on once i jumped the terminals...now idk where to look...i wonder if when i replced the main fuel line i put something back wrong...(like a vacuum hose)or maybe me not replacing the metal gasket that it had originally had something to do with it...but from my understanding i put everything back in its place

 

You may have a bad electrical connection somewhere? The filter you installed has a flow direction, I can't remember if it is possible to install it backwards, but look out for that.

What I would do next is check the fuel pump via FSM. Not just see if the car runs well with the jumpers in place. Follow the FSM. You could just have a bad pump?
http://personal.utulsa.edu/~nathan-b...87fuelpump.pdf

 

OK thanks bra...i will update as soon as i trace the issue...but you think that me not replacing the I.M. gasket when i replced the main fuel line has something to do with it?...