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1986 ford f150 fuel problems

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Old 10-10-2011, 05:39 PM   #1
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Default 1986 ford f150 fuel problems

i have a 86 f150..302 auto..4x4 with fuel problems.it runs fine when i pour gas in the throttlebody.the high pressure pump runs but the intank pumps dont do anything.its a dual tank.i 12 volts staight to the wires coming from the front tank and still nothing.it had red-black-orange-i cant remember what the other one was.lolany info is highly appreciated.
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Old 10-10-2011, 09:34 PM   #2
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...i 12 volts straight to the wires coming from the front tank and still nothing...

So, you tried putting 12 volts straight to the fuel pump and got nothing. Is that right? If so, it should run but since it didn't my first guess would be a bad tank ground. No ground=no run. You could hook everything back up, turn the key on and try grounding the tank by hand (maybe rub a wire between the tank and the frame) and see if you hear the pump turn on. See where that leads.
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Old 10-10-2011, 10:32 PM   #3
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Jump the fuel pump relay and see what happens, also check the tank selector switch. And make sure all grounds are good.
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Old 10-10-2011, 10:57 PM   #4
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where is the grounds near the tank?
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Old 10-10-2011, 10:59 PM   #5
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Quote:
Originally Posted by BLS View Post
...i 12 volts straight to the wires coming from the front tank and still nothing...

So, you tried putting 12 volts straight to the fuel pump and got nothing. Is that right? If so, it should run but since it didn't my first guess would be a bad tank ground. No ground=no run. You could hook everything back up, turn the key on and try grounding the tank by hand (maybe rub a wire between the tank and the frame) and see if you hear the pump turn on. See where that leads.
i cut into the wiring near the front tank and then put 12 volts straight to it.i didnt hear anything.
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Old 10-10-2011, 11:54 PM   #6
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IIRC the black wire on the connector is the ground wire, follow the wire harness back until you find where it attaches to the frame. BTW I had trouble with the power feed on my connector on my 94. It was corroded and dropping voltage.
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Old 10-11-2011, 12:10 AM   #7
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Originally Posted by ytsglock View Post
where is the grounds near the tank?
Pretty much anything metal on the truck (- side of the battery hooks to the body/frame) is a ground. (except the fuel tank of course) I'd probably use the frame.
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Old 10-12-2011, 07:22 PM   #8
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update ..got it running..it was the in tank pumps was rusted apart.wiring was off of them on the inside of the tanks.i installed a new pump in the front tank and it runs like new again.i thank everyone who helped with were to look for the problem.the truck needs to be driven more than it is.its just we have so many to drive and this is in rough shape..its really only used to clear the driveway in the winter with a snowblade.but anyways its back to running.thaNKSagain guys.
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