Question about Ford F-250

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My aux tank valve will not change from front to back, fuses are good , switch works good . engine stalls when I move dash switch from rear tank to front. but if I flip back real quick, it gets fuel and is fine.

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  • Anonymous Mar 13, 2014

    when switching from back to front tank engine cuts off



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Check your fuel pump in the front tank. The fact that it begins to stall - tells me that the valve is actually working - the front fuel pump just isn't pump fuel.

Posted on May 27, 2011


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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...

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

Nov 20, 2013 | 1990 Ford F150

1 Answer

Dual tank switching valve

sounds like you have a grounding problem

Mar 21, 2017 | 1996 Ford F350 Crew Cab

1 Answer

Not getting fuel. told not to use the rear tank

I had an 86 F150 with dual tanks, it had a similar problem. The problem ended up being the switcher valve (switches from one fuel tank to the other). Mine was electrically controlled and would switch from rear tank to front tank, but (front tank also had a leak) would not switch back to rear tank. I found out that my switcher valve (after I tried rebuilding the switcher valve myself, and determined that it was not repairable and needed replacement) was defective. They are also not cheap-about 10 years ago it was about $150! Don't know if yours is the same model, but I found the easiest thing for me to do then was remove the front tank, since it leaked (metal mounting straps worn through in spot where insulation came out sideways), and remove the switcher valve. I always left my tank switch set to REAR (dont know if anything would have happened if I had moved it to FRONT anyway, with valve and tank gone) and it always worked fine from then on out.

What you need to do is probably a 2 man job: Have someone inside the cab have ignition on and work the switch from one tank to the other, while you are underneath the truck at the switcher valve. Your job would be to determine if the valve actually works both ways, or just one way, or not at all.

Also there are fuel filters in several places: there is one in the switcher valve, further up along the frame toward the engine, and should be one somewhere on the engine, too. Also each tank should have an in tank pump. Several places to check, it's a big job, its messy, gasoline is toxic, not to mention explosive. Wish I had better news for you.

Hope I've been helpful.

Mar 13, 2010 | 1987 Ford F 250

2 Answers

Front fuel tank not working properly

Your truck has a mechanical switch that may not be working. Check it for power and ground.

One of the problems with 2 tanks is a lot of folks only run off of one and then you can get a sludge build up and could have a plugged pick up line.
Try this remove the fuel cap for the front tank.
Disconnect the front tank fuel line from the switch valve.
If you are not getting a good flow of fuel using low pressure air no more than 25 to 40 PSI blow back into the tank.
Now do you have fuel flow?
Your switch valve may be plugged on the front tank side - If you are getting fuel to the switch valve and not through it I would replace the valve.
You may also have a bad dash switch
Hope this helps Please leave a testimonial if it does

Mar 11, 2010 | 1982 Ford F 250

1 Answer

85 E-350 fuel problem

there is a switching valve under the vehicle that switches from front to rear. it may have gone bad or the switch itself may be bad

Oct 03, 2009 | 1985 Ford Econoline

2 Answers

1985 classC 350 econoline motorhome

Either the fuel line from the front tank to the switching valve is plugged or kinked, or the valve is not moving all the way to that tank (if electrically switched). Pull the hose (from that tank) off at the valve--do you get good fuel flow? If the front tank is lower than the valve, try switching the fuel lines from the two tanks at the valve, and set the switch for the rear tank. If it now runs, clean the valve or replace it.

Aug 08, 2009 | 1985 Ford Econoline

2 Answers

Where is the fuel tank selector valve exactly located

Just in front of the side tank is the selector.Very common problem.The rear fuel tanks pump quits.

Mar 30, 2009 | 1995 Ford F150 Styleside 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

1 Answer

Dual tank only runs on one tank

there is an electric valve that switches from one tank to the other. it switches the gauge too. It is malfunctioning and pumping fuel from one tank to the other instead of the engine. I think there wa a recall for this. Call any Ford dealer and give him your 17 digit VIN # and they can check for open recalls. Recalls never expire and the dealer will repair for free if there is a recall.
good luck

Jan 08, 2009 | 1990 Ford F150

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