call Bob or his son at
American Diesel Corp
PO Box 1838 (Rt. #3 North)
Kilmarnock, Va. 22482
Phone: 804.435.3107 Fax: 804.435.6420
he will know and he has the parts - I would guess a broken spring in the injector pump...he is the god of Lehman...did a ton of work while they were Ford...