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Old 10-13-2012, 12:43 AM   #279395
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Originally Posted by hizhinezz View Post
I thought that something similar had happened to me recently but then realized if just already filled up and forgotten about it.

How does this happen, buildup of vapors? Will it work if you hold the rubber sleeve on the gas pump nozzle back while trying to pump?
Typically the ventilation canister has a block in it, usually caused by liquid gas. As your pumping, the gas flowing in displaces air which would typically flow out through the ventilation canister. When there's an obstruction in the canister though, it causes an airlock that fools the pump into thinking that the tank is full.
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