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  1. #1
    New Member
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    Sep 2013
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    Saskatoon, Sk
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    8450 John Deere

    Default J D 8440 always hard to in summer

    8440 J D will start in the same day Ok when u get it going but by the next day
    it is back to being real stubborn --forget about winter starts .. we put an
    electric lift pump between tank and injector pump as per J D dealer suggestion
    but it hasn't helped at all. The pump just will not let fuel in until turning
    the engine over for 10 minutes and using starting fluid aids or bleeding injector
    lines every time. Any suggestions??

  2. #2
    Elite Member Tx Jim's Avatar
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    Coyote Flats,Tx
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    JD 4255/Kubota M7040 HDC

    Default Re: J D 8440 always hard to in summer

    Sounds as if you need to check the operation of the fuel check valve. AR73888 Check Valve ADD 44.75 USD
    Attached Thumbnails Attached Thumbnails J D 8440 always hard to in summer-rg1175_________un01jan94.gif  

  3. #3
    New Member
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    8450 John Deere

    Default Re: J D 8440 always hard to in summer

    HI, Tim Thanks very much for the info --- Is it located at back of injector pump? thks, Ron

  4. #4
    Elite Member Tx Jim's Avatar
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    Default Re: J D 8440 always hard to in summer

    I think it's attached to filter base but I'll have to do some research.

  5. #5
    Veteran Member kuboman's Avatar
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    B3200, L5740,

    Default Re: J D 8440 always hard to in summer

    It is attached to the inlet of the filter base. There is also a checkvalve/pressure regulator on the outlet of the injection pump. If either of those are faulty you will get fuel bleedback from the pump making for difficult starting. Also make sure that all you fuel lines on secure. If you have any rubber lines replace them. If they leak air then you will have bleedback too.
    L5740 LA854 loader
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  6. #6
    Elite Member Tx Jim's Avatar
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    Default Re: J D 8440 always hard to in summer

    kuboman
    Can you please point out the check valve at inj pump as I don't remember one?
    Attached Thumbnails Attached Thumbnails J D 8440 always hard to in summer-mp12543________un01jan94.gif  

  7. #7
    Veteran Member jimmysisson's Avatar
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    Default

    I'd be keeping an eye on the starter too if you normally crank it that long. I'd want ten seconds max, not ten minutes.
    Jim
    "Anything worth doing is worth doing slowly" Mae West

  8. #8
    Veteran Member kuboman's Avatar
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    B3200, L5740,

    Default Re: J D 8440 always hard to in summer

    Quote Originally Posted by Tx Jim View Post
    kuboman
    Can you please point out the check valve at inj pump as I don't remember one?
    It is #13 in this page shot. It is called a control valve.

    J D 8440 always hard to in summer-rgp2710________un01jan94.gif
    L5740 LA854 loader
    L3130 LA723 loader sold
    B3200 LA504 loader
    B1550 sold
    B2620 sold
    B4200 sold
    F2680E
    GF1800
    Kubota RTV900
    JD 850D Gator sold
    JD F935 x 2 sold
    JD 310D TLB
    Gehl 602 excavator

  9. #9
    Platinum Member
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    Dec 2001
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    901
    Location
    Maryland

    Default Re: J D 8440 always hard to in summer

    Item #5 in this picture is the check valve at filter base.
    Attached Thumbnails Attached Thumbnails J D 8440 always hard to in summer-rgp2295________un01jan94.gif  

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