Having problems with your 1994 GMC Jimmy ?

94 jimmy turns but wont start, I replaced the fuel pump and

\015 Turns but wont start, I replaced the fuel pump and filter. the battery indicator is on, the battery is good, I'm getting spark. I have not messed with the relay or ecu or injectors for that matter\015 Posted / edited by AnonymousUser on : 26-10-2020

Answers :

Check to see if you are getting the correct fuel pressure at the rail. It takes at least 55psi to push past the propets in the spider assembly. Cold weather requires even more psi. You can test this with a cheap fuel pressure gauge from almost any auto part store.

I would also check to make sure the ground for your pump has a good connection, it should be located around your rear bumper in the center. A weak ground will dramatically kill your psi, but still push fuel to the rails.

There is also a problem with the "expensive" spider assembly of that truck. The spider assembly holds the single injector and has 6 tubes going to each cylinder. The lines going into the assembly are known to leak. If you take off the manifold you can easily see if there are any leaks from it, there will be wash marks where the gas has cleaned it. Instead of buying a new spider assembly, there are rebuild kits for it.

If for come to the conclusion that you need a new fuel pressure regulator, don't let them lie to you in saying you need to buy the whole spider assembly. You CAN buy it separately for around $40. If you have problems finding it at local stores, search for it online.
See if your getting fuel to the top, find the fuel rail on the top of the motor you will see a bleeder valve push in the the little serator valve and see if fuel comes out. if not the pressure regulator could be bad. if none there take the filter loose on the pump side and see if fuel comes out there. i believe this has the spider type injector setup on it and this could be bad.
Repair Help & Product Troubleshooting for 1994 GMC Jimmy

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