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What causes a gas tank to be pressurized? 200 1979

posted by  yama on  Fri Jan 5 00:44 CST 2007
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last visit: Fri Oct 25 05:26 CST 2013
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I believe the tank is under vacuum due to the overfill recovery system. The overflow tube goes to a charcoal canister located near the battery. The canister is also connected to a hose that goes to the intake manifold creating a vacuum. When you open the cap air rushes due to the lower pressure.

Having said that I wonder if a charcoal canister was used in 1979. A whole lot of pressure or vacuum might indicate a problem.






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