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
How to adjust injection pump on a small cam cummins
Discussion in 'Ask An Owner Operator' started by Tbag3, Dec 16, 2025 at 2:11 PM.
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