I recently acquired a 1983 F-250 regular cab with one previous owner and a known issue…the engine heaving for gas once it dropped to the half-tank mark.
Both fuel pump and fuel filter had been recently changed, among other small maintenance adjustments including new sparks and wires. In driving it down from the mountains following the vehicle transfer, the engine completely died at half tank. I then poured 2 spare gallons into the tank and it started up and finished the journey home. Prior to arriving home, I filled the tank completely and it only took 6 more gallons (19gal tank). So this doesn’t seem to be an issue of a fuel gauge malfunction.
I’m perplexed. How is it that it can run fine at full tank, but upon reaching half it begins to sporadically shudder, as if not getting enough gas? If I continue to run the truck beyond half, it will stall or not start at all. Put a couple more gallons in, and it starts right up. When it’s on half and won’t start, it still fires with starting fluid. I suspect there’s an air leak in some component in the tank.
Thanks for any thoughts.