I have a '96 F150 L6 and have been told by a dealership that the "check engine" light is on due to a weak fuel pump in the forward tank. In the process of running the fuel level down in the forward tank, and then running exclusively on the rear tank, I have discovered that fuel is being returned to the forward tank. Is there an independant directional valve, or is there a back pressure valve built into the fuel pump?
- posted
19 years ago