Fuel pump running with key off
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Junior User
Joined: Sep 2010
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Fuel pump running with key off
Hello. I have just registered for what I am sure are many more questions to come 
. I just purchased an old '91 F150 XLT Lariat "beater". Among a long list of problems that need attention is a fuel pump problem. The first time I drove it (over 30 miles) the fuel tank continued to run with the key off. Since the front tank is inoperative, I flipped the selector switch to that tank and the pumped stopped. After it sat for awhile, I was able to set the switch to the rear tank again without problems. I assume something is becoming overheated and grounding the circuit. Has anyone heard of this happening? What would be the most likely culprit here? Oh how I miss the days of one mechanical fuel pump and a carb! 
. I just purchased an old '91 F150 XLT Lariat "beater". Among a long list of problems that need attention is a fuel pump problem. The first time I drove it (over 30 miles) the fuel tank continued to run with the key off. Since the front tank is inoperative, I flipped the selector switch to that tank and the pumped stopped. After it sat for awhile, I was able to set the switch to the rear tank again without problems. I assume something is becoming overheated and grounding the circuit. Has anyone heard of this happening? What would be the most likely culprit here? Oh how I miss the days of one mechanical fuel pump and a carb!
Senior User
Joined: May 2010
Posts: 140
Likes: 0
From: Spokane Valley, WA
I had the same problem in my 90 F150 and it was just a bad fuel pump relay. Replaced that with one from Schucks that only cost me like $10-12 and haven't had a problem since. Easy fix, really.
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