I have a 95 Blazer that wouldn't start. After checking all the fuses and relays, I found I was getting voltage at the fuel pump, but the fuel pump was not pumping fuel. I dropped the tank and replaced the fuel pump. I was then able to start the car and it ran for 30 seconds fine. Then it just cut off - no sputtering or hesitation, just cut off like I turned it off. Now it is doing the same thing it was before I replaced the pump - cranking but never catching. No blown fuses or anything.

Anyone have any suggestions ? I'm at a loss with this thing.

 

Did you do the standard fuel pressure test prior to and after changing the pump? If so, what are the numbers?

 

If you remove the fuel pump relay and jumper such that you force the pump on, does it run?

 

I will have to get ahold of a fuel pressure tester again, but before I wasn't getting any pressure up front.

I will try to remove the fuel pump relay and jump it today. I'll do a search to find what pins I need to connect

 

The relay should have a diagram on it. Just have a look there for the switched connection. Connect those two pins together. If I remember correctly, it is something like pin 30 to pin 87...

 

I just got in. I tried to bypass the pins at the fuel pump relay, still could not hear the pump coming on and the blazer wouldn't start. I'm still trying to get my hands on a fuel pressure tester. None of the auto stores carry rentals.

I probably won't be able to mess with it again until this weekend. I'm going to try the test wire in the engine bay directly to the battery and see if the pump comes on then.

 

If jumping the relay did not turn on the pump, the pump is likely bad. The next step would be to test for voltage at the fuel pump assembly. If you have voltage there, then your pump is bad.