i have 91 F 150 4.9 ENGINE . It will crank and run fine then just goes dead . If i switch tanks it will crank back up and run fine , then you drive for a while and it goes dead again .

Asked by Jun 24, 2015 at 09:41 AM about the 1991 Ford F-150 XL 4WD LB

Question type: Maintenance & Repair

if i'm running the front tank it runs fine for a while , then dies . i switch to the rear tank , it runs fine for a while then dies . i switch back to the front tank and it cranks back up and runs fine . It repeats this process ,

1 Answer

19,350

It sounds like you may have two bad fuel pumps. But what is the chance of that? If you can force it to malfunction in the driveway immediately run a fuel pressure check on the offending tank, then the other. It's going to be a process of elimination in a no run condition.

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