Unless you're trying to build a "numbers-correct" car show winner, common sense dictates that a flexible line is needed between the engine and the steel line down the frame rail, and another from the cab to the frame at the tank. However, common sense is a scarce commodity among stovebolters these days.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!