Question about 1990 Ford F150

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When you turn on the key/ fuel pump runs on both front or rear tank as you switch tank from F to R and you never hear it stop running

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  • Ford Master
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The fuel pump relay is under the hood, replace it it may be stuck on.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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csmock132
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SOURCE: I can't get the fuel to the engine from rear tank only

Does this have three fuel pumps? One in each tank and one on the frame rail. I know it at least has one in each tank. It doesn't have an electric switch valve. It has a mechanical one that makes sure the fuel returns to the right tank. When you flip the tank switch the power switches to the pump in the other tank.

Posted on Sep 02, 2009

emissionwiz
  • 76649 Answers

SOURCE: my 1994 f250 will not start when the fuel tank

the problem is the fuel pump inside the front tank is defective, it is not a fuel filter, the fuel from both tanks fuel pumps runs through the same filter

Posted on Feb 18, 2010

Testimonial: "Thank you..i was hoping for the easy fix..i appreciate your help sir! "

  • 1584 Answers

SOURCE: Iam getting no voltage tto my fuel pump,front tank

Poor earth connection most likely causing hifgh resistance voltage drop.

Could also be a faulty pump. Run a separate power supply to it and recheck.

Posted on Mar 10, 2010

  • 1 Answer

SOURCE: 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.

Posted on Oct 24, 2010

wadembly
  • 475 Answers

SOURCE: I have a ford f250

there usually is a dual take valve switch under truck which could be the problem

Posted on Dec 03, 2010

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1 Answer

I have a 2000 gmc 3500hd,the fuel gauge stopped at half way and i run out of fuel. the rear tank is not sending fuel to the front tank?


David Johnson is wrong about that. The Chevy HD dual tank has two sending units, one in each tank , one fuel pump, a fuel pump relay switch and a equalizing pump. If the truck stalls out at 1/2 tank, it is the equalizing pump. That pump, pumps fuel from the rear tank to the front. If the pump is out, the front tank empties, the truck shuts down, the guage reads half tank because the back tank is still full, but the equalizing pump won't pump the rear fuel tank load to the front. Hence the problem you listed above, not a sending unit.

Dec 15, 2011 | Cars & Trucks

1 Answer

My 1994 f250 will not start when the fuel tank toggle switch is on the front tank. it runs fine on the rear tank, im thinking clogged fuel filter or possibly fuel pump stopped working. where do i find the...


the problem is the fuel pump inside the front tank is defective, it is not a fuel filter, the fuel from both tanks fuel pumps runs through the same filter

Feb 18, 2010 | 1994 Ford F250 Supercab

1 Answer

Switched to rear tank pump wasn't running. removed rear fuel pump. switched to front tank and started ran and stopped won't start. rear pump is off and the lines are open.


jump over relay on the ground side of relay with the ign. on because of the start & run curcuit in the computer activates the fuel pump relay. then you can hear the pumps.

Nov 19, 2009 | 1990 Ford F350

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

1 Answer

I have a 1991 Ford F150 4 x 4 inline 6 4.6L. Dual


your truck is a 4.9L, make sure you have power to the front tank fuel pump. is the power to the pump is ok and you can hear the pump run for a second or two when you key the vehicle on... replace the fuel tank selector valve

Apr 17, 2009 | 1991 Ford F150

1 Answer

Trucks runs on back tank, won't run on front tank


most likley the fuel pump is bad in front tank

Apr 09, 2009 | 1996 Ford F150 Regular Cab

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

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