Replaced the fuel tank on my M813.
From
A Tale of Two Fuel Tanks we determined that the replacement tank was from an M39, which required "some" modification for use in an 809 series. Welded and tapped two, 2 inch steel fillets for the fuel vent system. Don't know what the paint on that tank was but needed a wire wheel and sanding disk to get thru to bare metal.
My first time with a MIG welder (and it shows) but they're attached and I didn't burn through the tank.
Duplicated the old vent lines using 1/4 inch brake line, 1/4 inch tube compression fittings and the old collars and elbows.
Fabricated the fuel pickup from 1/2 inch copper pipe brazed into a pipe thread adapter screwed into a pipe thread elbow which was brazed to a 8 inch round steel fillet. Had a pipe thread fuel line made up. Reasonably sure I have a vapor proof seal, truck starts on the first pull provided the engine's warm, love that block heater.
Replaced one of the tank straps with new old stock as the old one had rotted out. After everything was installed and 5 gallons of fuel added, found a pinhole leak where the drain collar is welded to the tank. Should have filled with water first, would have been an easy brazing fix. Now I have to drain the tank and use JB Fuel Tank Weld.
