I have an 1986 F150 with the dual fuel tank option. When I switch it to the front tank the fuel gage reads full and the engine runs normally. When I flip the switch to the rear tank, the fuel gage reads empty (even though it is full of fuel) and the engine runs normally but it is drawing fuel from the front tank. I know how is is supposed to function, but I cant figure out why it continues to use fuel from the front tank even though the switch is set to the rear tank, and why the gage reads an empty rear tank when it is full.
Any help will be greatly appreciated!