Went out to start it the other morning. It would crank but not start. As long as the starter was engaged it would run. Checked fuel system and everything OK. glow plugs are working. tried electrical system and as far as I can get under the hood. Could it be the switch or something under the dash? I can't get under the dash because of back problems. I'll have to send it out somewhere if I cant get to it. Thought I would check with you guys before I hauled it to the shop. Thanx.