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How to adjust injection pump on a small cam cummins

Discussion in 'Ask An Owner Operator' started by Tbag3, Dec 16, 2025.

Page 2 of 2
  1. Dec 16, 2025 #11
    W923

    W923 Road Train Member

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    In my experience the slow return to idle is often caused by air in the fuel….think suction side small leak or possibly injectors need adjusting and are letting a small amount of compression into the fuel rail.
    I assume you already checked this but is the throttle rod preventing the pump lever fully returning to idle
    This would match very closely to your symptoms and it doesn’t take much
     
    W923, Dec 16, 2025
    W923, Dec 16, 2025
    #11
    1999 C12, Oxbow and Tbag3 Thank this.
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  3. Dec 17, 2025 #12
    Tbag3

    Tbag3 Light Load Member

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    Thanks I’ll make sure to check that out
     
    Tbag3, Dec 17, 2025
    Tbag3, Dec 17, 2025
    #12
    Oxbow Thanks this.
  4. Dec 22, 2025 #13
    Tbag3

    Tbag3 Light Load Member

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    I’ve noticed the difference in big and small cam pumps have different adjustment screws so on the small cam behind the bell shaped cover is the idle screw at the end of the shaft, is that correct
     
    Tbag3, Dec 22, 2025
    Tbag3, Dec 22, 2025
    #13
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