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Subject: Diesel Question

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Tom8n396936    Posted 06-23-2018 at 11:47:29 [URL] [DELETE]        [Reply] [Email]  
  • Diesel Question
  • I am only a poor at gasoline mechanics but even worse with diesel. My JD 250 skid steer will not run.Sounds like it wants to but can't get fuel. I changed out the fuel filter assuming this was the issue -nope. I then noticed the fuel water separator was leaking. Upon closer inspection the bottom of that unit is missing??? Leaking fuel.Would this cause a loss of pressure and account for the machine not starting? May sound like a dumb question and I am sure it is dumb. Just need someone to comment. It seems this would cause the problem but I want to be sure.
    thank in advance for any comments.

    Island Mike    Posted 06-24-2018 at 10:55:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: Diesel Question
  • It will not run if it is sucking air, or air has got in the lines. First make sure there are not leaks from the tank to the injectors. If it has a decrompresion lever, use it. Crank the engine over. Follow the fuel pump to the exit line, probably goes to the second filter. Open the relief screw on top. Fuel should come out, then close it. You should now have raw fuel from the tank, past the big filter, past the fuel pump to the small filter. All that is left is the lines to the injectors. Some diesels like to be bled at the injector. If it does not fire, then bleed each injector. Often if you get one or more piston firing the other pistons will fire soon as the air gets pumped through. You unit may differ a bit, but that is the basic figure out how it is done.

    Island Mike

    Tom 8N396936    Posted 06-24-2018 at 18:34:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Diesel Question
  • OK thanks guys. I guess that more describes what I was asking Mike. After my initial panic I thought it out. The filter actually fell off the water separator and she was sucking air. After some thought i realized what may have happened and I looked for the filter and seal ring. Both had fallen way down but I recovered and reinstalled them. Turned the key and let the pump run a few minutes and them cracked open the water filter until fuel came out. Cranked it a dozen times and the air must have purged and she started up!
    Thank for all the insight. I love this board but while I don't really have much of value to contribute I do read it often.
    Thanks again gentlemen!

    Andy B (MI)    Posted 06-23-2018 at 22:12:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Diesel Question
  • I don't know too much about diesel's either, but it sounds like you might need to bleed the fuel system. Should be bleeders around the filter(s) and on or around the injector pump.

    Sorry I can't be of much help

    Richard NY 2N    Posted 06-24-2018 at 07:50:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: Diesel Question
  • If you have the owners manual they should have the info you need. My 4200 doesn't have bleeders on the filter. Instructions say keep restarting till it stays running. Older tractors do have bleeders.

    Tom8n396936    Posted 06-24-2018 at 07:24:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Diesel Question
  • Andy, Thanks for the advice. It seems like its sucking air into the fuel system. You may be right... I will check into it.
    Thanks again!

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