I don't know about the Duece and 1/2, but the 5 tons use a fuel pump that adjusts for the viscosity of the fuel. They will run on anything from trans oil to 40 weight is about the limit. I saw a mechanics class try one on 90 weight. It run for a few minutes then died. Keith
U. S. Navy Seabee Veteran.
We build, we fight , we drink more beer.
When you are up to your butt in alligators it is heard to remember the reason you are here is to drain the darn swamp.