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Thread: 8T cat12 starting problem solved

  1. #1
    Join Date
    Jul 2016
    Lancaster CA

    Default 8T cat12 starting problem solved

    Ever since I have had this machine, I need a small squirt of start fluid to make it fire. Never has built fuel pressure when cranking. Recently changed the poppet in the fuel pump. $50.00 wasted. New gaskets on top of the fuel tower. No help. crack the tower bleed screw and it has air in it. Bleed and it fires. Shade tree solution: Brazed a lever to the bleed screw. Get it cranking pop bleeder open then close and it fires right up. Now if I can get some rain on these country roads, I can go out and play. Hasn't rained since April.
    Cat 12 grader, 8T6995 running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 22, ser#438

  2. #2
    Join Date
    Nov 2011
    Estevan sk


    so it's making air? have you check over the back filter plate well as there might be a crack in it. glad to see you got it solved as i don't like the use of summer in a can. that beaning said i to have a few can's around my place.

  3. #3
    Join Date
    Nov 2006
    Faunsdale, AL USA


    I think this is a grader or wheel loader problem. Or if a tractor's tank is real low. A good solution is a return line to the tank from the top of the filter housing. Some industrial engines had them. I think you could make one by connecting a hose to the filter bleed drain line and then just crack the bleed valve a tiny bit. Don't want to bleed away too much flow, just enough to let the air purge. Is that line one that has a T ???
    D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time

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