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Fuel going from rear tank to the front

 
Old 06-10-2019, 05:26 PM
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Angry Fuel going from rear tank to the front

I have a 94 Ford F-150 4x4 5.8 and when I fill up the rear tank and drive it some of the fuel goes to the front tank.the switch is new.i have a new pump on the way for the from the tank.it looses pressure. I have 2 pumps on this truck.could it be a selector valve or do I have a one way valve on my fuel pump?
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Old 06-10-2019, 06:58 PM
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Originally Posted by Jason62371 View Post
I have a 94 Ford F-150 4x4 5.8 and when I fill up the rear tank and drive it some of the fuel goes to the front tank.the switch is new.i have a new pump on the way for the from the tank.it looses pressure. I have 2 pumps on this truck.could it be a selector valve or do I have a one way valve on my fuel pump?
Check valve on the front pump has failed, allowing fuel to pump into the front tank.
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Old 06-10-2019, 07:24 PM
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Ok sweet that’s all I needed to know.got the whole unit coming in the mail.
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