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I just pulled the gas tank on my '80. I want to replace the rubber lines, but the stock ones are "S" shaped. Is that necessary? Can I just use straight lines? Why did GM make them like that?

Jack
 

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They may have been straight at one time but over time being in the same position they have taken shape. Most hoses are flexible enough to go about anywhere. :poke:
 

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If you put a "s" the hose it will have some to flex in case of vibrations or something ,like a rock, jumping up and smacking the hose. If the hose is straight from connection to connection and something hit it it ay pull it off the fitting. On some of our a/c we have rebuilt or built we actually use a loop in the line to soak up vibration and jolts. Also you may want to use a hydraulic type hose since they are so much tougher.
 

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Make the new hoses long enough to make a loupe. I believe the original hoses were long and S shaped in order to pull the tank enough out of the way in order to detach the hoses at the tank.

Doug
 

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The approved fuel hose is plenty tough, so don't use any other type. The compound in fuel hose is made for fuel, use it. Not necessary to leave a whole bunch of slack in the hoses. They don't shrink very much. Leave them over-length at the tank nipples until the tank is bolted up in there, and cut to length with a bit of slack & hook'em up. I've never seen S curves in fuel hoses. Maybe a factory thing to speed up production on the later Elcos ?
 
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