I own an 83' F250 with the 6.9L diesel engine. The other day I was driving down the road, and it just died on me. I noticed the fuel gage showed a 1/4 tank left, but knew the gauge was faulty at times, so I switched to the rear tank, purged the air from the lines using the valve on the fuel filter, then tried restarting, nothing, wouldnt fire. I also noticed a burning smell when I stopped, kind of like and electrical fire. Just last night, I noticed a wire had indeed melted in two on the passenger side engine compartment. Upon following the wire around, I noticed it went to a connector that connects to the top of the injection pump. I remember reading in the haynes manual that it might be the shutoff switch for the injection pump. I pulled a couple high pressure lines off the injector to see if any fuel was being pumped from the injection pump, and not a drop came out. I am pretty sure that wire that melted has something to do with the injection pump, but cant figure out what its purpose is, and how to correct the problem. I tried touching the two ends together that melted, nothing. I noticed the wire comes from a connector that has the power wires that go to the glow plugs, and also noticed that the wire just makes a complete circle, ending at the injection pump. Also, the wire, which is red with greens lines on it, goes to a little box on the front grill, behind the head light, on the passenger side. Im not sure what it is, or if that might have been damaged due to the short. Another wire that is on that same line going to the pump, connects to a wire that ties into the fuel line that connects to the fuel filter housing. Again, I think that is some kind of fuel shut off wire. Any and all help into this matter is greatly appreciated. I am without my truck right now, and really need to get it fixed. I am hoping it is a simple fix. I dont think the pump went bad, it just wont pump fuel due to that wire being melted. Thanks again

Jason Brown

 

You might want to post this on the pre-powerstroke diesel page also. Those guys might have some answers for you. Good luck.