Quote:
Originally Posted by Jim Maxwell
No vents in the original tanks. Jim
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Which can cause problems if the tiny amount of air the original cap passes goes down for any reason. Cars with really high fuel use per hour (think stroker engines, Webers, and high speed touring long distances......or open track play) can draw a partial vacuum on the tanks. If that happens fuel flow to the engine is hampered and the tank tries to collapse. Original terne plated steel tanks are made with leaded crimped seams and leaded over "tinner's rivets". Drawing a vacuum on the tank makes the tank flex more than normal and make the leaded seals break sooner than later.
I have heard car's tanks "sucking air" just after coming off track and shutting down. Next comes the sound of the tank walls popping back into position.