I think you would be better off getting the correct type hose from one of the venders. The rad hose would probably get you by, but some of the stuff they put in todays gas is very corrosive to rubber, unless it's made for fuel use. Especially ehtanol. Not only could you end up with fumes in the cab if it eats though, but anything that it dissoves will end up in the tank and fuel system. If you do want to try the flaps, ask for fuel filler hose rather than fuel line. Sometimes you gotta be absolutly specific with those parts guys or you'll either get a "we don't have it" or a "it doesn't exist" answer.

Bill Burmeister