I don't see this working.

An engine driven welder must have the engine rpms at a precise speed otherwise weld output will suffer. Usually diesels spin at a much lower rpm than gasoline engines, therefore unless you spin the diesel at high rpms (which could be damaging, I don't know the rated rpms on that particular motor) then output will be substantially limited.

If you want to run something other than gasoline, there are companies that make propane conversion kits.