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if the entire line isn't rusted, and you can get a flaring tool back in there, flare a new fitting on on where it broke, add a union, and a new fitting on the other side. Or just replace the whole line.
Pulling the bed instead of dropping the tank is the way to go. I had the same exact thing happen to mine. If you choose to replace the entire line it's over 100" long for my truck and that's with the rear abs module and being a sc. If possible, do as Buffman suggests, that'd be your best bet.
I'd go with Fordsflylow's suggestion. Pulling the bed is really a joke compared to dropping the tank. Lots of threads on it, but its just removing the six torx bolts that hold it on(don't mix up the order) and I believe 3 screws that hold the gas filler pipe on. The truck is old enough that it would benifit a good going over with the bed off. You'll be amazed with how easy it is doing chassis work behind the cab with the bed off. You'll be tempted to change out the rear brake lines while its off and clean up the frame. The underside of the box will scream for a cleanup.
Mine blew out above the fuel tank and I replace it be using a couple of auto supply premade lines and threading then through where the old line went. Had to do some slight bending in the rear once the line came through, but did not have to drop the tank or pull the bed.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.