MEP802A-MEP803A-MEP80x Upgrade Replacement for Fuel Tank Well Nut A3816. This is a brass machined fitting upgrade to the rubber well nut originally found on many military generators. This includes a Viton O-ring which is a very strong rubber for fuel and oil contact. Each tank requires 2 units. Many people have also overtightened the old well nuts which can cause premature failure through cracking. This upgraded solution does not depend on deformation and is far more secure and longer lasting. It is much simpler to install correctly. Make sure all surfaces are clean and dry upon installation and no debris prevents a good seal.
Installation: The O-ring is placed on the inside of the tank. The nut is installed on the outside of the tank. You have to remove the strainer to get your arm inside the tank to install this fitting. To replace the upper well-nut, you may need to remove additional items. One trick is to run a wire from the fuel tank fill opening down into the bulkhead orifice. Then you can drop the inner piece and O-ring down the wire and move into place, then install the nut.
Note: This product is a functional upgrade to the A3816 Well Nut or NSN 5310-01-197-1473.