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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 06-16-2009, 05:45 PM
cdevor cdevor is offline
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1989 F250 Dual Tank Selector Problem

I have been reading different posts and wanted help in figuring out my problem.

1989 F250 7.5L with a fuel tank switching issue and neither fuel gauge works. With no power, the rear tank shows maybe a 1/4 but when power is applied reads empty. The front tank doesn't move.

Also,

Truck currently runs off rear tank only, front tank does not work, truck dies when selected. I know the fuel selector switch works, so my next thought is the fuel selector valve/dual tank reservoir? It looks to be mechanical, no electrical switch?

Describing the fuel gauge issue and selector issues, does this sound like the valve? If so, how do I remove fuel lines, do I just remove the push tabs that lock and pull off the fuel lines?

Thanks.
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Old 06-16-2009, 05:47 PM
ssquints999 ssquints999 is offline
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when you select the front tank and turn the key to the run position can you hear the fuel pump priming (buzz for 2-3 seconds)
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Old 06-16-2009, 05:52 PM
cdevor cdevor is offline
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Yes, I tried that and I can hear the front tank priming.
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Old 06-16-2009, 06:18 PM
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Quote:
Originally Posted by cdevor View Post
Truck currently runs off rear tank only, front tank does not work, truck dies when selected. I know the fuel selector switch works,
How do you know that?


Quote:
Originally Posted by cdevor View Post
so my next thought is the fuel selector valve/dual tank reservoir?
Could be but you need to make some test.


Quote:
Originally Posted by cdevor View Post
It looks to be mechanical, no electrical switch?
Yes it is mechanical valve with on power to it.

Quote:
Originally Posted by cdevor View Post
Describing the fuel gauge issue and selector issues, does this sound like the valve?
Could be but you need to make some test.


Quote:
Originally Posted by cdevor View Post
If so, how do I remove fuel lines, do I just remove the push tabs that lock and pull off the fuel lines?
Yes that is about it.


When you go to pull the lines off mark the location so you can put them back on in the right place.
Get a bucket and a old fuel pump vacuum gauge.
Take the larger fuel line off going into the valve from the tank that does not work and stick it in a bucket. Ground pin #6 of the EEC self-test connector and turn on the key. If fuel pumps out of the hose turn off the key and hook the fuel pump vacuum gauge to the hose. Turn on the key and see if you get 5-7 PSI fuel pressure. If so it does not look good for the valve. If you do not have the fuel pressure and you can hear the pump run you will have to drop the tank or remove the bed. It may be a bad pump or a bad hose in the tank.
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Old 09-15-2010, 07:36 PM
Olpro41 Olpro41 is offline
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locating selector valve.

Hey All. I have a 1988 Ford F-350, crew cab dually. For some reason my forward gas tank isn't working. I've replaced both the internal and external pumps. I can hear them when I turn on the ignition and the guage does register the amount of fuel when I use the in cab selector switch. My last thought is the selector valve. My manual doesn't give the location. I see the resovoir where all the lines (6) are located but not the valve. Are they one in the same? Any help is welcome.
Sam
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Old 09-15-2010, 08:11 PM
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Yes they are one in the same.
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Old 09-15-2010, 08:11 PM
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