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Fuel pump started making lower sounding noise when priming and wouldn't prime after a while. Let is set over night and it primed once and ran it for an hour, but didn't prime the rest of the day. Did this same thing for 3 days, but now it never primes.
Checked fuses and swapped relays and tried to jump pin 87 to 30 and still would not prime. Testing the fuel pump relay socket I get strange readings on pin 87, which I believe is the input pin from the battery, pin 30 is output. When I tested the AC relay socket I get 12V on pin 87, but get strange readings like 25V sometimes more on pin 87 on the fuel pump relay socket.
I know what a job it is the replace the in-tank fuel pump, I replaced it 4 years ago. This time it has a full tank of gas. I'm almost sure the fuel pump has gone bad but want to fix the cause of the problem this time.
I don't want to ruin another fuel pump and these readings are worrying me. Any ideas?
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