I recently picked up a 89 F150 4.9 5 Speed. I have only put about 20 miles on it so far. The front tank reads about 1/4 tank and the truck runs fine. The rear tank reads about 1 1/4 tank and will intermittently act like the truck is running out of gas. If I put in the clutch and hold the gas pedal down a little more, it will usually resolve the issue, but sometimes I have to switch to the front tank.
Could this be the infamous valve to switch between tanks?
Thanks, Ted