ECU Fuse Blown

Have you tried tracing the wiring to see if there are any shorts? damaged or frayed wires?

I traced what I think is the problem to the fuel guage. If I leave it unplugged at the tank the ECM fuse does not blow and the pump runs fine and the car starts. I am only getting 7.5 volts at the fule guage plug at the tank. The manual states that I should have battery voltage (12volts). i can only assume that with the lower voltage there must be some increased resistance and thus blowing the ECM fuse through the Main Relay. I am going to check the grounds and see if they are good for the fuel guage. If this makes any sense. I will continue to diagnose further and let you know.

Thanks

dougan said:

I traced what I think is the problem to the fuel guage. If I leave it unplugged at the tank the ECM fuse does not blow and the pump runs fine and the car starts. I am only getting 7.5 volts at the fule guage plug at the tank. The manual states that I should have battery voltage (12volts). i can only assume that with the lower voltage there must be some increased resistance and thus blowing the ECM fuse through the Main Relay. I am going to check the grounds and see if they are good for the fuel guage. If this makes any sense. I will continue to diagnose further and let you know.

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Increased resistance shouldn't blow a fuse.

There's a longish general autorepair faq I found that describes something similar, drop in voltage due to a rotten wire. But I bet you've got short.