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Old 08-14-2010, 04:21 PM   #1
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Default 94 F150 Fuel System Problems

This is my first time trying this here is my current problem when I run on my front tank it continues to draw fuel from my rear tank but if Im on the rear it only pulls from the rear any ideas is there a tank selector valve and if so were would I find it?
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Old 08-14-2010, 05:07 PM   #2
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i'd check out your switch and make sure its not sending power to both first
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Old 08-14-2010, 05:10 PM   #3
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How do I go about doing that can I check it at the switch or do I have to try and check at the pumps?
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Old 08-14-2010, 05:35 PM   #4
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Check it at the switch. How do you know it's pulling from both? Many of these trucks pump fuel back to the wrong tank, but not draw from both.
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Old 08-14-2010, 06:07 PM   #5
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take the switch out, check continuity from the power receiving side to each sending side, if it has continuity from one to both, then its bad. it should have continuity from the receiving to ONE of the sending sides at a time

*edit* if your truck has a third pump(i dont know which model years did and didnt) then there might be another pin that has power ALL the time on the sending side, but i'd assume the frame pump wouldnt go through the switch
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Old 08-14-2010, 07:50 PM   #6
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I checked it at the switch and it seams to be functioning corectly it seams that even when the front tank is out of gas that it will continue to run with the switch still on the front position.
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Old 08-14-2010, 08:03 PM   #7
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Here,,,,,,,,,,,,,,,,,,,,,,........................ . I figure you must be out of them!
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Old 08-14-2010, 08:50 PM   #8
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Tank selector valve, mounted on the driveside framerail.
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Old 08-14-2010, 09:13 PM   #9
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Thanks for all your help. I will give that a try.
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Old 08-14-2010, 09:55 PM   #10
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'94 doesn't have a tank selector valve.

These trucks also have a problem with the fuel level sending units so the gas gauge doesn't read right. Maybe you just have more gas than you thought.
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