4020 Fuel issue

samxmccarty

New User
Hey, i have a 1968 JD 4020. The tractor was parked around 5 years ago and was running great at the time. The tractor has been a one owner unit and is in great shape. I am having trouble getting fuel to the injectors now, and havent been able to get it to start. I have bleed the filters and the lines to the injection pump. I have steady fuel when cranking from the bleed port on the other side of the injector pump inlit. I also have good fuel on the bleed port near where the return line connects to the injection pump. However, I can't get any fuel through the injection pump, with the throttle in mid or any position. I have loostened all the banjo connections on the pump, and the compression fittings near the injectors. Not a drop of new fuel from anything when cranking. I think the tractor throttle may have been left in fuel shut off mode when the tractor was last parked, and the shutoff mechanism has frozen shut. I am looking for someone who has knowledge of the inner workings of these pumps, and can point me in the right direction. I included a picture of the model placard on the pump!
https://imgur.com/gallery/nAzjYyw

Thanks for reading and youre help!
 
I am sure that you pulled the throttle down off the stop position...but I gotta ask... if so rattle the foot pedal like your mad at it, the internal linkage may be hanging up in the off position..just some thoughts...
 
Times two what Al said, stuck internal parts. Any traces of water in fuel, or bio diesel will stick the plungers, metering, and delivery valve. Had a CAV DPA pump last week with governor weights stuck in the cage, they would not fall out with the bio tar buildup..
 
I figured that the pump needs to be rebuilt, can anyone give me
documentation on how to do so? I have never been in an injection
pump of this vintage. I have tried all sorts of throttle positions, rattling,
tapping on IP, etc.

Thanks
 

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