Good point.

Wanna bet?

 

Nope. Like I said, it's only a guess.

 

The sensors are operating on 5VDC, so the ECU surely has an internal voltage regulator. Most of the modern voltage regulators have the input capacitors of high capacity, that will accumulate the spikes, and they (the regulators) are usually able to survive somewhat a higher voltage than 12V. Possibly it might have a varistor too. I haven't been looking the exact board, but if it was designed well, it probably has a fuse + transil diode right on the power line input. If voltage goes above the certain level, the diode shorts and blows the fuse. There are many ways to protect for reversed polarity/voltage surge and so on... Although I am not 100% sure in this very case, I'd bet on that

 

Well, she said she can hear the fuel pump running, and it's not getting fuel, so what's your guess?

 

I don't like guessing. It's like a handicapped engineering. We need the test results. But still remember this:
https://blazerforum.com/forum/2nd-ge...e2/#post696975
and I have the feeling it might be related.

 

 

You may need a battery disconnect switch. Best ones are a knife switch. Trying to find a good remote battery disconnect switch, bought one from China and can't get through the directions to make it work.

 

Before replying to a thread...check the date. This thread is over two years old; original poster is likely long gone.