Blown ECM-B fuse

[BCarpenter]

I have a 96 Tahoe 5.7L.I was driving the other day an the engine just died.After checking the fuses I noticed the ECM-B fuse was blown so I replaced it.It started right up with no problem.I let it run for about 20 mins.then went on a road test.When I was driving it blew again.I replaced the fuse again an drove back.I also noticed that my fuel pump relay was heating up i'm not sure if that has anything to do with it or not.Can anyone please help me

[777stickman]

Originally Posted by BCarpenter

I have a 96 Tahoe 5.7L.I was driving the other day an the engine just died.After checking the fuses I noticed the ECM-B fuse was blown so I replaced it.It started right up with no problem.I let it run for about 20 mins.then went on a road test.When I was driving it blew again.I replaced the fuse again an drove back.I also noticed that my fuel pump relay was heating up i'm not sure if that has anything to do with it or not.Can anyone please help me

ECM-B fuse supplys 12v power to the VCM and to the fuel pump through the fuel pump relay. The fuse is "hot at all times". Since it's not blowing just sitting there I think it's not a problem with the circuit to the VCM. The fuel pump relay getting hot would be the circuit to look at. The circuit works like this. There is always 12v from the ECM-B fuse to the relay. With the ign switch off the circuit to the fuel pump is open. With the eng running the contacts in the relay are pulled in supplying 12v from the ECM-B fuse to the pump. The wire to the relay from the fuse is an orange one and the wire out of the relay to the pump is a grey one.

Lots of posts on the connector at the pump being bad, corroded, etc. Could be the pump going bad, drawing more than 20a. Could be a wire rubbed bare and shorting out going to the pump. Lots of things to check out.

Hope this helps and please post back so we all can learn..........Steve

[BCarpenter]

Thank you very much.I'll check it out and see what I find.