Tractor does have a 50 series motor. Tractor runs fine without an implement. When you take it to the field, put the field finisher in the ground, the tractor will want to die. Local John Deere Dealer threw parts at it i guess. New Injection pump, Injectors and turbo... same Issue. My Turn to go look at it i guess. My plan is to rig a clear plastic line from tank to injection pump lift pump and see if im getting air bubbles. I dont have much experience with these tractors, Is there a supply tube that goes down in the tank where supply line hooks to? I looked on JD parts and didnt see anything. Anybody have any advise or experience with this issue? Thank you.