I successfully replaced the metal filler neck on my 5065e, to avoid transportation costs to and from dealer (even though parts covered by warranty). My filler neck and chain (connecting cap to neck ) were badly rusting. I am assuming defective anodized coating? Anyway, the metal neck has 4 tabs that fit in between these plastic vertical ribs molded into plastic tank neck. The metal filler neck is threaded into the plastic tank neck with a rubber O-ring seated on the top flange of plastic neck . Take a flat blade screwdriver and bend tabs up 90 degrees to free interference fit, using needle nosed pliars. The new metal filler neck comes with 4 tabs ( spaced 90 degrees apart ) already bent 90 degrees out so you can screw the metal neck into the plastic neck. When you feel resistance from the O-ring seating, turn it a few more ribs to compress it. You obviously have to center the metal tabs between the plastic vertical ribs. Then just bend them down between plastic ribs to create an interference fit . When you remove cap, the counterclockwise rotation is resisted by the tab engagement. My dealer had a customer that was removing the metal filler neck every time they removed fuel cap because the tabs were not bent down . So if you are having corrosion of the metal filler neck, the repair is easy. I did use a pipe wrench to break gasket seal because the installer put silicone over rubber O-ring and that created some resistance to removal . The parts diagram did not identify silicone so I just used O-ring. Works fine.
