Okay, coming to the guys who know these newer engines than me. I am used to the old 350 or 396 Chevy muscle car engines, so need some help. Looked thru some past posts, and could not find the answer, so here goes.

My daughter's '95 S10 4wd Blazer will not start at all. It cranks over quickly, but will not even begin to start up. What should I check, or do, to get this beast running.

Thanks for the help.

 

Listen for the fuel pump. If you don't hear it, it may be dead. Battery in good shape?

 

Battery is in very good shape, it is only a few months old, and a heavy duty unit. Where is the pump located that I should listen at?

 

First things to check would be fuel, air, and spark. 3 things necessary for an engine to run.

If you don't hear the fuel pump, it can be any one of 4 things, the fuel pump fuse, the fuel pump relay, the ignition switch, or the fuel pump itself. Check the fuse first. If you have a digital multimeter, check for voltage at the fuse, then check for voltage at the relay. Pin 85 should be 12v trigger from the PCM, Pin 86 is the ground for the coil side, Pin 30 is the 12v source for the fuel pump through the fuel pump fuse, and Pin 87 is the wire to the fuel pump. Pin 86 is always connected to ground. When the PCM sends a signal to the relay, it energizes the coil to pull the contacts of pin 30 and pin 87 together to power the fuel pump.

If you do hear the fuel pump, then it is possible that you are lacking spark or air. While cranking over the engine, have someone put their hand on the exhaust. They should feel pressure trying to push their hand away from the tail pipe.

Checking for spark is the same as with older engines. Pull a plug, plug it back into the wire, and ground it. Turn over the engine and watch the plug.

*EDIT* - Pump is located in the tank and should be audible from the drivers seat with the door open and a relatively quiet environment.

 

Thanks swartlkk, going out to check it now. Next question is, which fuse would I be looking for? (location) for the fuel pump fuse.

 

I believe the fuel pump fuse is located in the underhood fuse box along with the fuel pump relay, but I'm not exactly positive on that for a '95... There should be a label in the fuse box to help you out though.

 

It is is the fuel pump, you will have to drop the gas tang and remove it from there. Replace the screen too if it is the pump. :P

 

Well, tried listening for the pump, no noise at all, so don't think it is working. However, cannot find a fuse box under the hood at all. Any help on that? I do know the pump is in the tank, not looking forward to replacing that at all.

 

Uh oh, is the fuel tank full? It was 1/2 empty/full when I replaced mine. If you can have someone start it, and you stand beside the BLazer, and confirm the pump is dead.

 

You really need to confirm that the pump is getting power by finding the fuse AND relay before even considering pulling the tank and pump out. I don't have a clue where the fuel pump fuse or relay are on a '95, so someone else with one will have to pop in with that info.

This same thing happened to my landlord with his van. He had the pump replaced, replaced the fuel filter, replaced fuel lines, and all because the he never checked for power to the fuse, then to the relay, and then verified at the pump. I think that you should be able to pull the connector off of the pump (on top of the tank) to verify 12v+ at the pump. But the easiest way would be to find the relay and fuse.