Fuel issue has me stumped!!!


Asked by Dec 20, 2015 at 03:56 PM about the 1989 Ford F-150 XLT Standard Cab SB

Question type: Maintenance & Repair

1989 f150 4.9l 2wd lariat with dual tanks

I am a first-time poster, tapping out to a fuel issue! I
was driving down the road, truck wasn't getting
enough gas sputtered badly then died. Got it towed
home (thanks roadside assistance!). Replaced the
in-line fuel pump and fuel filter.

I still cannot get any pressure to the fuel rail. I
disconnected the hose from the in-line pump to the
reservoir, put it into a gas can, and the in-line pump
pressure rises rail perfectly. So I know it has to be
upstream of the reservoir. I can hear both the front
and the rear tanks pumps running when I turn the
key on. However, when I disconnect the front and
rear fuel lines from the reservoir, neither one in
pumps fuel out of the lines.

it has me really confused! Is it possible that both my
front and rear in tank pumps went out at the exact
same time? To where they would be able to run, but
supply zero fuel? What else could it be?

I have checked voltage to the front in tank Pump
and it is a perfect 12 V.

5 Answers

Kelly Mayo

did you blow out / clean the fuel lines?


Everything downstream of reservoir. However what are chances of both tanks' pumps and/or lines both getting clogged?!

Bob Beaman

Could there be an issue with the valve that switches between the tanks?


Don't think so. Have pulled both lines from both in tank pumps from the reservoir valve and neither pump is spitting out fuel

Bob Beaman

Then the in tank pumps are bad or their pick up screens are clogged.

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