TC 40 A will turnover but not start. I checked all the saftey switches, injecter pump seems to be working. Put some fuel in the intake and it diesals but won't catch. I thought I smelled something burning a month or so ago after the glow plug light went out but couldn't find anything, reset the key and it starte. Smelled some thing burning the other day when it took a crap and still could not find a hot spot and would not start after resetting the key. HELP