Fuel system malfunction

Asked by Jcprice Feb 12, 2019 at 03:28 PM about the 1989 Ford F-150 XLT Lariat Standard Cab SB

Question type: Maintenance & Repair

I have an 89 f 150 with two fuel tanks, the truck claims its running from the front
tank but then the truck will die and have no gas in either. also when I fill up both
tanks have gas missing. Any ideas.

2 Answers
290

1943JRM answered 5 years ago

My 1987 F-150 w/4.9 had the same problem last summer. Tried sorting it out myself, but I finally had to take it to the Ford dealer I trade at. They sorted it out and it works fine now. Probably most independent repair shops could do the same.

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9,730

Mike answered 5 years ago

There's a tech bulletin out for these vehicles where the rear tank pumps into the front tank overfilling it. Check with Ford but I think you need to replace the front tank fuel pump and sending unit.

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