Abstract: An apparatus has: a recreational vehicle (RV); a fuel tank connected to supply an engine of the recreational vehicle (RV); a fuel filler neck connected to supply the fuel tank; a neck extender sleeve with a first threaded end secured to a threaded fuel inlet of the fuel filler neck; and a fuel cap secured to a second end of the neck extender sleeve. A method has the following steps: supplying fuel from a fuel nozzle into a neck extender sleeve, through a fuel filler neck, and into a fuel tank of a recreational vehicle (RV); and in which the neck extender sleeve is threaded to the fuel filler neck, and the fuel filler neck is connected to the fuel tank.