how to bleed Delphi Injector Pump
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Thread: how to bleed Delphi Injector Pump

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    how to bleed Delphi Injector Pump

    I been having problems starting this tractor JD 1120 3cyl. Over the last 3 months it sometime takes a lot cranking to get this diesel going.


    I just change the transfer pump and that allow it to start on the 1st try but I had a leak between the pressure side to the Water Separator so I change the fittings and bleed the line. Now the tractor will not start.

    I have fuel when I bump the engine over at the pump inlet, but no fuel at the injectors ( I could only get to the 2 back ones ). Do I need to bleed the injector body? if yes, what are the bleed screws?

    Could the inlet be gummed up or clogged?
    Attached Thumbnails Attached Thumbnails IMG_20180916_185645316.jpg   IMG_20180916_185641847.jpg   IMG_20180916_185603703.jpg  

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    Photo below shows both bleed screws. Open each separately then crank engine over to remove any air in IP. After air is bleed close bleed screws.
    Attached Thumbnails Attached Thumbnails Capture.PNG  

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    Thanks, I will try that this weekend.

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    Okay my injector pump is bleed but I have no fuel at any of the 3 injectors. I do hear fuel returning to the tank at the return line. Does anybody know if any thing can be cleaned or service in the end cap? I have approx 4 bolts at the end cap and I also took a peek in the inlet and seen a spring/plunger item. Any clue as to what that could be ?

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    Hi number78
    What part of the injector pump do you call the cap end? If you are referring the the piece at the right of the picture, this is the charge pump which supplies fuel to the three piston's that supply the individual injectors. Seeing there is fuel getting returned to the tank from the injector pump, and you have bleed the pump then the fuel is at the pump. When you are say there is no fuel at the injectors is that when you loosen the injector lines at the injector's there is no fuel coming out?
    Regards John

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    Quote Originally Posted by John 54 View Post
    Hi number78
    What part of the injector pump do you call the cap end? If you are referring the the piece at the right of the picture, this is the charge pump which supplies fuel to the three piston's that supply the individual injectors. Seeing there is fuel getting returned to the tank from the injector pump, and you have bleed the pump then the fuel is at the pump. When you are say there is no fuel at the injectors is that when you loosen the injector lines at the injector's there is no fuel coming out?
    Regards John
    John, yes the thing to the right. I seen a few youtube videos and they are working on a CAV pump and they called that a "cap". I looses 2 of t he three lines at the body and no air or fuel either.

    The pump was serviced back in 2012/2013 by a friend of my dad's and the tractor has always been reliable with start up. No smoke or steam.

    Over the course of 2-3months, I've notice this tractor being harder to start and not starting on the1/2nd blip of the starter.


    You ca use this youtube video or the CAV and goto the 50min time mark on the cap

    CAV Injection pump full strip down to re seal and stop fuel leaks - YouTube
    Last edited by number78; 09-30-2018 at 10:39 PM.

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    Okay to follow up. I torn my injector pump down and part of my problem was a sticky inlet metering valve. It had signs of moisture and tarnish. I also rebuilt the inlet and cleaned up the injector head. I thought my cam ring was worn but a diesel shop confirm it was okay.

    If anybody else have a DPA style pump a few youtube videos exists on tear down and resealing . You can do a search on "CAV lucas pump"

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