Question about 1990 Ford F150

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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

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  • 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

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: F-250 FUEL PROBLEM

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 - http://www.fordf150.net/forums/viewtopic.php?p=227833 - http://www.fordf150.net/forums/viewtopic.php?p=46861

Posted on Feb 12, 2009

Healeyman
  • 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

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