Ok, so I am back at it again.... The Fuel Pump relay keeps on acting intermittently and I am trying to figure out why it burns them up but if I tap on them I can get it to work for a little while longer. Now I am just rotating through the burnt ones I have to get the blazer started when I need to go somewhere. But why would it be burning up through relays? Could it be the ignition switch doing this, I doubt its the brand new ac delco fuel pump that is in it. I've checked the grounds and they look good.

The mechanic in town said my tank has about a 1ft dent in it, and that its causing the pump to work too hard and is burning up the relays but I don't believe cuz it runs fine once it gets started.

Can anyone throw me a bone possibly on this one?

 

I can think of a couple of things off the top of my head that could cause this. Having a dent in the fuel tank is not one of them.

A bad ignition switch is always a possibility and they are a known high failure item on these trucks.

First thing to do is to check your voltage at the relay. You should have a solid 12v there. Anything less and you will be toasting relays and eventually your pump.

If you have a good reading at the relay then you should check the voltage at the pump connector. Again you should have a good 12v at the connector. Again anything less and you will be killing relays and damaging your pump.

If you have 12v at the relay but not at the pump then the fault lies between the relay and the pump and is most likely a bad connector to the pump. (another common failure item) Or a fault somewhere else in the harness between the front and rear of the truck.

If you don't have 12v at the relay then the fault is most likely somewhere between the ignition switch and the relay. Depending on the year of your truck this can include a faulty oil pressure switch.

If your voltages are good at both the relay and the pump then things can start getting ugly on tracing the problem.

let us know how things check out and we can go from there.

 

I am going to check that out here in a minute with my voltmeter, now that you bring up the faulty oil pressure switch, would that cause the truck to die sometimes when at an idle when the oil pressure is lower than normal driving?

 

By the way its a 95 Blazer with the 4.3 in it...

 

It could as I believe that in a 95 the oil pressure switch still helps to control the fuel pump.