How do you change the back gas tank on 1991 Ford F150?

Answer 1

If you have a spair tire, remove it and the holder. Drain the tank. Support the tank. There are two straps with two bolts each(front and back of the tank) to be removed. Lower it slightly to gain access to the fill hose. This is a rubber hose over another hose that goes into the tank. There is a hose clamp on it. There is a plug for the sending unit to be removed. You can reach it on top of the tank and pull it out. On top are two fuel lines. They have a plastic clip inserted in them that pushes out and allows you to plull the lines off the fittings. Some gas may leak out of these lines when you pull them off. If you are not going to replace the tank you have to plug the lines so or they will leak. If you are replacing the tank make suure you know which fuel line is which.