help

[wannabelow]

the P.O did a hack job on the truck and pulled the gas tank out from behind the seat and put a tank in the bed of the truck its all bolted in and safe(so they say) and under the cab pass side right below where the 2 rubber groumets are the have the return line the the fuel feed line then they have one that has just been criped off and it a steal line the what i think is the brake line
whats the 3rd line of the bunch and should it be hooked back up some were?
i am just getting in to this thing and i will mostlike have more question on it


thanks