Question about 1990 Ford F150

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My truck will only run on the back tank ive replaced both fuel pumps the fuel filter the tank selector switch and the fuel pump selonid

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Check the tank selector switch. my truck has gone through two of them in 6 years so far.

Posted on Apr 17, 2010

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Front Fuel pump I hear it come on for a few seconds, back fuel pump, nothing comes on, when I switch it over to front, noise, back nothing

Posted on Nov 20, 2009

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The selector valve on the frame rail is the problem. Its call a resevoir at ford you might get lucky and find one at the junk yard, its not rebuildable.

Posted on Nov 20, 2009

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You might have a leaky fuel line

Posted on Nov 19, 2009

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Related Questions:

1 Answer

Truck fuel pump only runs if i jump off inside dash behind tank selector switch, already replaced steering column pump outside tank, pump relay tank selector switch relay pigtail dist moduel feel like...


mine was doing the same...switch was bad. a bit convoluted really but if your high pressure pump is running and not getting your tank pumps to go, unless you jump there at the switch harness prolly the switch.

Dec 29, 2009 | 1989 Ford F 150

2 Answers

Back fuel pump is running all the time and is pumping fuel into front tank on a 1990 ford f150


I would drop the tank and replace the pump. These types of problems are fire hazard.

Oct 26, 2009 | 1990 Ford F150

2 Answers

My f350 1997 will not run on the rear tank . how do i go about finding what the problem is?


well, first, to find out if its the in tank fuel pump or the tank selector valve, the cheapest and probable easiest thing to do is find the selector valve under the truck and switch the incoming fuel lines. front tank to rear tank inlet, and vice versa. If the truck still doesnt run, you either have an electrical delivery problem to the in tank fuel pump or a bad fuel pump. If after switching the lines, it does run, then you need a new selector valve

Sep 23, 2009 | 1997 Ford F350 Crew Cab

2 Answers

1987 f-150 dual tanks fuel problem


You are right. There are three pumps. It sounds like the transfer pump in the front tank is bad. The in tank pumps just supply the high pressure pump to keep it primed. You need the front pump.

Sep 21, 2009 | 1987 Ford F 150

1 Answer

Hello asking the same question about my 1989 Ford F350 supercab duelly pickup. Has 7.5l (460) eng C6 Trans. the problem is losing voltage to intank pump on both tanks. the fuel selector switch show 11.56...


OK, guessing you know your truck. Without a pressure switch the pumps would run all the time the ignition is on. do they run ok without pumping? (pull one out of the tank). Do you have a relay that the tank selector switch activates? Most cars run the hot lead active, and the pumps run by applying the return lines. Your problem could be in the wiring from the pump back to the negative.

Sep 17, 2009 | 1989 Ford F 350

1 Answer

Front fuel tank will not work


You have duel tanks with a fuel pump in each tank. You also have a fuel pump on the frame rail after the "tank selector". This device only holds a fuel filter that protects the main fuel pump. When you select front or rear tank on the dash, you are selecting which in tank fuel pump will operate. You can check the in tank fuel pump by listening for it to "humm" when the key is turned on..The in tank pumps only feed the main pump and cannot run the engine on their own. Hope this helps

May 16, 2009 | 1989 Ford F 150

2 Answers

When I switch from my front fuel tank to my rear tank gas stops


There is no selector valve on a 1995 ford f150 300 engine. The selector switch on the dash sends power to the pump in the selected tank. The pump then sends fuel to the engine. If engine won't run on the selected switch, the pump in that tank needs replaced.

Mar 28, 2009 | 1995 Ford F150 Styleside Regular Cab

2 Answers

Fuel Tank


as long as the fuel pump is running you must have a restriction in a fuel line.
good luck
paul

Sep 28, 2008 | 1998 Chevrolet K1500

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