It is the filler tube, not that expensive, $50-$75, you can spend up to $190 if you want, but this is not a Ford OEM required part, IMO.
Make sure you get the right one for your model and bed style
You can replace it without removing the bed, but you need small hands.
You could unbolt the bed(6 bolts), and unscrew the 3 filler screws and then jack up(lift) the bed on the filler side(not too high, watch tail light wires) and put a block of wood in to hold it up, then jack up the truck to work under it, jack stands please, lol.
On another note, the EVAP system puts negative pressure in the fuel tank to prevent gas fumes from polluting the air, so with a hole in the filler tube you should get a CEL(check engine light), which you didn't mention.
Since you just bought this truck I am wondering if CEL has been disconnected(bulb pulled)
Does the CEL come on when key is first turned on and then go off?
Last edited by RonD; 09-03-2014 at 11:30 PM.