Help: I have an F150 2 whl drive pickup, manual transmission. Straight 6 cylinder.
The gas flows from front tank into the rear tank. Not a huge problem, but when you fill both tanks, gas starts running out of the rear tank because the front one is still trying to fill the rear one. Gas mileage doesn't look good at all, when it is like this. I have changed all of the plugs and filters, where do I go from here?