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I'm spitballing here, but I had a similar problem when I bought mine: tons of hissing when I removed the fill cap, and even gas leaking out of the filler when the tank is full on a warm day.
The problem with mine was the activated carbon canister was hooked up backwards, preventing it from venting through it and pressurizing the tank. Not sure if that's the same cause as yours, but it's worth a look. If the canister is blocked in some other way it could cause the same issue.
 
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