That might be an idea. Originally, there was a vinyl tube connected to a black plastic canister attached on the left side of the trunk; a T fitting is connected to a check valve, and another tube runs from the canister to the intake manifold. Usually a sticky or broken check valve is the cause, but now your tank is breathing in the trunk! It must be especially bad after you fill up the tank.
Another solution would be to block it AND use a vented cap. Or maybe just a check valve to let the tank suck in air as fuel is being consumed by the engine?
Another solution would be to block it AND use a vented cap. Or maybe just a check valve to let the tank suck in air as fuel is being consumed by the engine?