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2010 Prostar with ISM long crank to start

Discussion in 'Trucks [ Eighteen Wheelers ]' started by BlueRiver44, Nov 10, 2023.

  1. Nov 10, 2023 #1
    BlueRiver44

    BlueRiver44 Bobtail Member

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    Dec 18, 2022
    0
    Looking for any advice to start troubleshooting.

    2010 Prostar with Cummins ISM. Everytime I go to start it it cranks along time. Always starts but cranks for too long.

    Doesn't matter if its hot or cold weather. Ive tried cycling the key multiple times, leaving it on if it needs to warm up screens. Its usually pretty consistent in how long it takes to crank and start which makes me think it is something electrical.

    It has a FS 19624 fuel filter/separator, and from my research that is correct.
    No separate lift pumps on ISM, the pump seems to be working fine because it runs great once started.


    I have access to Insite if that can help,
    Truck Vin AN225287

    Very much appreciated if anyone has some thoughts to share
     
    BlueRiver44, Nov 10, 2023
    BlueRiver44, Nov 10, 2023
    #1
    singlescrewshaker Thanks this.
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  3. Nov 10, 2023 #2
    singlescrewshaker

    singlescrewshaker Road Train Member

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    Dec 31, 2017
    Little Havana, FL
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    My '94 M11 will have what I consider "long" cranks from time to time. (2.5-3 sec)

    Usually turn out the petcock on my BF1259 fuel filer isn't as tight as could be..

    What are you considering "long" cranking time.?
     
    singlescrewshaker, Nov 10, 2023
    singlescrewshaker, Nov 10, 2023
    #2
    BlueRiver44 and BoxCarKidd Thank this.
  4. Nov 10, 2023 #3
    BlueRiver44

    BlueRiver44 Bobtail Member

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    4
    Dec 18, 2022
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    Id say getting close to 5 seconds. Which seems very long to me.

    I will check the drain bolt on the filter and all lines around there again, thanks for the reply and info.
     
    BlueRiver44, Nov 10, 2023
    BlueRiver44, Nov 10, 2023
    #3
    singlescrewshaker Thanks this.
  5. Nov 12, 2023 #4
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    There should be a compucheck plug on the side of the fuel pump you can measure output fuel pressure from. Cranking pressure should be 25 psi or higher. When pumps start to get old, they get weak and cannot drawn the fuel as well anymore and cannot build enough pressure during crank to cause long starts. If your pressure is taking a long time to build up, it could be time for a new pump. Some trucks also have test fittings before the pump, on the filter header for measuring inlet restriction. 6" of Mercury is about standard max allowable for inlet restriction. If inlet restriction is ok and fuel is not aerated, it might be pump time.
     
    Heavyd, Nov 12, 2023
    Heavyd, Nov 12, 2023
    #4
    singlescrewshaker and BlueRiver44 Thank this.
  7. Nov 13, 2023 #5
    BlueRiver44

    BlueRiver44 Bobtail Member

    7
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    Dec 18, 2022
    0
    Thank you Heavy D, I was hoping the International Master was going to see my thread and drop some knowledge!
    I will check the pressure on cranking and report back.

    Picked up this old Coke truck from California and brought it to the farm to spend its retirement years hauling grain. This was its first season and it did really well. IMG_20231001_1909400439_HDR.jpg
     
    BlueRiver44, Nov 13, 2023
    BlueRiver44, Nov 13, 2023
    #5
    Heavyd and singlescrewshaker Thank this.
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