the fuel line from the fuel tank to the lift pump on my truck is shot. It seems to be a dealer only part...as of today from the stealership its $190...what a JOKE....its a piece of tubing into a rubber hose and back to steel.

is there any reason why I cant just replace the line with a rubber hose?

i dont see why not

I am considering adding a auxillary fuel tank.....and now seems like a good time to do it....any suggestions on how to do it?

regular line will be fine

Just make sure the hose is Diesel Rated.