Fuel system

i had this problem on my '95 f150... if your front fuel pump does not work, the fuel in your back tank will slowly be pumped into your front tank, i just got out a gas can and a primer bulb off of my outboard motor, and simply siphoned out the gas from the front tank and filled the back tank back up untill i had time to replace the front fuel pump... it a fairly common but simple problem with the lat 80's to early-mid 90's trucks... every other week i switch between tanks just to make sure everything is in working order for the long road trips i take every other month

aaron is right...if the one pump is dead that tank will only fill up... its strang the way ford set it up... the other thing is make sure u get the right pump if u replace, there is a high pressure system and a low pressure system

There is a recall on that.and I think it is still open .it installes a check valve in the lines between the tanks.

My 88 did that sometimes. I learned to never run the rear tank first. Run the front tank, then the rear tank and this will not happen.