Question about 1990 Ford F150

1 Answer

I have a 1989 Ford f350- Dual tanks. When I switch fromt eh rear to front tanks, it does not worka nd continues to draaw from the rear tank. My research show that if the pump in the front tank was bad, the vehicle would die. So, either the fuel switch on the dash is bad or the selctor valve for the two tanks. How do I check the switch on the dash (the cheaper of the two fixes) any help would be appreciated. Jim

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 599 Answers

Memory serves me the fuel gate valve between the two tanks goes bad ...need to find an old diagram but, testing the switch is done there as well... power to one side switched the gate valve to front..power to the (other pin) switched to the rear tank... find which pin lights with a test light when you call the front tank.. if it lights your valve is bad and not switching

Posted on Nov 20, 2013


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 1 Answer


Hi, My brothers 250 had the same problem and is now fixed.The fuel pump in each tank has a check valve that allows the fuel to run in one direction only. When this valve fails to close fuel runs into that tank when the other pump is running. We replaced the pump and all is well. Dan

Posted on Jan 25, 2009

  • 184 Answers

SOURCE: 1990 ford f150 has dual tanks. gas pumps from rear tank to front

See these two threads for more info, I've heard of this happening before, in fact at one time there was a recall from Ford regarding this exact issue - -

Posted on Feb 12, 2009

  • 1198 Answers

SOURCE: dual tank no fuel/1989 F250

The metal fuel line on top of my 89 Ranger fuel tank rusted out. What a pain. For all the trouble of dropping the tank and wrestling with the fuel assembly, definately put in new stuff, don't try to fix anything with jb weld like I did. It's a shame the body bolts are such a bear, or I'd say to try to remove the bed for a good look-see. After all was said and done, I cut a trouble door in my bed so I could replace the filler hose if I ever get one. Just don't do any cutting while the fuel tank is there, even with a saw or grinder, they all spark!

Posted on Apr 26, 2009

  • 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

  • 975 Answers

SOURCE: 1989 Ford F150 Lariat Dual tanks...rear tank is

Thet don't have a switching valve,the switch just turns on one pump or the other.
Ford dealer has a fix ,a short piece of line with a one way valve,just snaps on to both lines .simple install,just buy the part,they will know what you are talking about at the parts counter,

Posted on Nov 19, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Dual tank switching valve

sounds like you have a grounding problem

Mar 21, 2017 | 1996 Ford F350 Crew Cab

1 Answer

Engine shuts off when switched to rear gas tank

if it leaks from one tank to another, i deeply suggest you change fuel pressure regulator

Dec 01, 2011 | 1997 Ford F350 Crew Cab

1 Answer

1989 ford f-250 460 c. i. super cab with dual fuel tanks. Will only run on the rear tank and then forces gas out of the front tank thru the filler cap onto the ground. It will not start or run when...

I would suggest the Equalizer valve for the Twin tanks has failed. Track the fuel supply and return lines to locate its position.

Mar 14, 2011 | 1989 Ford F 250

1 Answer

My 1989 f250 has dual tanks, it only wants to pull gas from the rear tank and the return fuel fills the front tank. we have replaced the dash switch and the pump twice. it seems to work for a short time...

Make sure you have the check valves in place on the lines at the sending units on the tanks. If the switching valve on the frame rail goes bad it can push fuel back up the return to the opposite tank than you are pulling from causing fuel to push up and out the inlet. If these were not removed and replaced on the new sending units they will have to be purchased from the dealer.

Nov 05, 2009 | 1989 Ford F 250

1 Answer

Front fuel tank not responding

based on my 20 years in a Ford dealer your problem is the front pump.

May 21, 2009 | 1989 Ford Econoline

2 Answers

I just bought a 1982 ford F350 with dual tanks. I can't find out how to switch tanks from one to the other. It looks like it came from the factory with both tanks?

I also have an 1982 ford F350 with dual tanks. there should be a switch in the heater control cluster to the right. looks like the blower switch.If no switch someone could have changed the bed on truck. Hope this helps

Nov 29, 2008 | 1982 Ford F 350

Not finding what you are looking for?
1990 Ford F150 Logo

308 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers


Level 3 Expert

5546 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides