I have a ZZ4,TPI in my 40 ford. When I come home from a drive I get a lot of fumes from the vent hose in the rock valley gas tank. There are no leaks around the fuel tank. I have a non vented gas cap that screws on to the filler neck. Some guys have told me to put a charcoal filter on the vent tube. Anyone got any ideas. Please help, my wife's office is right over the garage so you know what that means.

Thanks