a fuel tank assembly comprises a fuel tank having a wall with an outer surface and an inner surface , an elongated single or multi - walled tubular body having a first open end and a second open end , the first open end extending outwardly through an opening in the tank wall , and the second open end extending inwardly into the tank and bonded to the tank wall along the periphery of the tank wall opening by an adhesive which bonds to low surface energy plastic materials , the adhesive providing a fuel vapor - tight seal at the interface between the tubular body and tank wall opening , the fuel tank and the tubular body having fuel barrier property .