I am leaking fuel out of the canister. I have replaced this component as well as the little one way valve. I had the fuel pump replaced about 3 months ago. I can release the pressure by loosending the gas cap and that relieves some pressure, but I can't drive around with it like that. Any reason why I am building up enough presure to push fuel up through the canister? I had just gotten gas but only filled it up half way. Any suggestions would be appreciated. Is it possible the shop put the hoses wrong on the fuel pump?

M