Question about 1986 Ford F150 SuperCab

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1986 F150: Rear gas tank results in engine sputtering/dies

1986 F-150, fuel injected, 302ci. When I use the rear gas tank, the truck runs rough and sometimes dies. Front tank is fine. Excelerating down the road, when I switch from front to rear, the symptoms repeat regularly, almost instantly when I switch. My first thought was contaminated gas in rear tank, but could it be the switching unit? If so...where is it located?

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  • Ford Master
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I think u have a bad fuel pump, switching unit does nothing but not allow fuel to be pumped from tank to tank, for example if useing rear tank lets feul flow to engine not iti nto frt tank,when it goes bad you will see gas flowing out of frt tank because its pumping into tank from rear tank,good luck.check fuel preasure w rear tank is on.

Posted on Oct 06, 2009

Testimonial: "Thanks for the response. I checked w/the Ford dealr parts guy who said each tank pumps directly 2 engine. Not sure how it works on other trucks tho."

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  • Ford Master
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You are going to have to replace the in tank low pressure fuel pump, we call this the "lift" pump.

Posted on Oct 06, 2009

Testimonial: "Wow...fast reply! I think I waited all of 4 minutes. Thanks!!! Now it's time to get my knuckles whacked. :-)"

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