I have a 2001 F150 XLT. I recently had my fule tank replaced because it had a leak. The garage that did the work did say the tank had a hole. Yesterday I picked the truck up. they had put a used tank on it. I would assume they inspected it before installing it but that is not a given. I filled the tank last night and All of the gas with the exception of 1/8 of the tank drained out onto the ground. It was not a pressure spray, it looked more like gas pouring from a faucet and did not change flow with the truck running or off.
I do not believe the leak is on the high pressure side because it continued even when the truck wasnt running. It was pouring out at a amazing rate. It looks like it is some sort of siphoning action that got started when I filled the tank and did not stop until it reached the 1/8 mark. The truck ran fine even while gas was pouring out of it so the high pressure side looks fine.
I had filled it with 5 gallons just after I picked it up and that did not leak out. Any idea where I might look to see what is going on here?