An old forklift with a JD engine. Sat for years and I had it running fairly well. Started to slowly operate hydraulics to move to a flat surface and it quit running. Found a fuel leak in the steel return line and welded it up. has new fuel filter and fuel. has hydraulic fluid in resivour. starting fluid will start it but it dies out. Bled the system to the injectors and looks okay. lift pump seems to be okay. I'm trying to get it serviced to place back into use. anyone have an answer?