Ford F150 Forum - Community of Ford Truck Fans

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-   1987 - 1996 F150 (https://www.f150forum.com/f10/)
-   -   Fuel going from rear tank to the front (https://www.f150forum.com/f10/fuel-going-rear-tank-front-448939/)

Jason62371 06-10-2019 05:26 PM
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?

BLDTruth 06-10-2019 06:58 PM
Originally Posted by Jason62371 (Post 6226102)
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.

Jason62371 06-10-2019 07:24 PM
Ok sweet that’s all I needed to know.got the whole unit coming in the mail.


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