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Old 05-23-2022, 09:19 PM   #1
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Dpf question

I have Cummins ISL 8.9 400 hp that has the dpf an not def. Wondering when refueling or stopping for a quick lunch, is it okay to leave engine idling rather than shutting engine off? Not sure about clogging up dpf filter idling.
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Old 05-23-2022, 09:35 PM   #2
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when refueling? Absolutely Not..
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Old 05-23-2022, 10:14 PM   #3
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Yes it will clog your DPF.
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Old 05-24-2022, 01:45 PM   #4
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Never ever let a late model emission controlled diesel engine idle any longer than absolutely necessary, it will cause very expensive problems.
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Old 05-24-2022, 01:57 PM   #5
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The only time youd want to keep it running, preferably driving at speed under light to moderate load, would be when the DPF is going through the regeneration cycle. From what Ive heard, this most commonly occurs just as you reach your destination.
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