C15 Cat wont start

Discussion in 'Trucks [ Eighteen Wheelers ]' started by silver dollar, Nov 7, 2012.

  1. 508darrinh

    508darrinh Bobtail Member

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    Dec 2, 2012
    Lakeville, MA
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    Where is this check valve located? In the housing where the primer pump is? Or is it in the housing whit the fuel water separator? My Pete has this type of problem. Won't start after it's been sitting for a day or two. Sits just over night it starts right up. I try to prime it with the hand pump, but that doesn't seem to stiffen up while i'm pumping it. Am I supposed to open a bleeder somewhere while pumping it?
     
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  3. Superhauler

    Superhauler TEACHER OF MEN

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    100,730
    Jan 30, 2010
    keep stroking.
    0
    check valve is on the filter base that's on the engine, right behind the filter on the bottom of base. a 1 inch wrench takes it out. don't over tighten the new one when installed.
     
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  4. morehp

    morehp Medium Load Member

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    Jun 18, 2012
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    IMG_0622.jpg just a picture to back superhaulers descriptiopn up, hope it helps you


     
    508darrinh Thanks this.
  5. silver dollar

    silver dollar Medium Load Member

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    Jan 31, 2009
    Central North Carolina
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    If your Pete has a Davco filter/separator, there is a check valve at the unit to prevent fuel from draining from the Davco back to the tank. If the fuel level in the Davco drops after sitting a couple days, the check valve in the unit may need replacing; or air maybe entering the unit at the bottom plate seal.
     
  6. Loaderlou

    Loaderlou Medium Load Member

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    131
    Feb 24, 2014
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    Hi guys, I'm having the same problem. Yesterday once I got it started it ran a little rough so I quickly used the primer pump to bring back the pressure. Once I got it to run smooth after a few strokes I left the plunger out and it ran fine all day. Does that sound like a primer problem or a check valve problem or both? A friend recommended changing the filter housing, possibly a cracked housing, but no signs of stalling or struggling for fuel after I got it running smooth. Thanks for any feedback
     
  7. peterbilt_1

    peterbilt_1 Bobtail Member

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    Dec 3, 2015
    nc
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    i have an 1988 379 pete with a c15/3406 and it didn't have a problem, I pulled up and cou it off and now it want started up it sound like when I try to started it up the jakes are staying on and the motor will stop turn over can some one please help me out
     
  8. AModelCat

    AModelCat Road Train Member

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    156,644
    Jul 7, 2015
    Canuckistan
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    Old thread. So if I get what you're saying, the jakes are stuck on? Also are you sure that's a C15 in there? Unless one's been retrofitted in there you likely have a 3406B. Those mechanical Cats usually don't have an idle cutoff for the jakes so it is possible to stall the engine with the jakes.
     
  9. peterbilt_1

    peterbilt_1 Bobtail Member

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    Dec 3, 2015
    nc
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    I don't have a mechanical motor its a 1LW motor
     
  10. Berrycarter

    Berrycarter Bobtail Member

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    Nov 5, 2017
    0
    My 6nz dose the same but only over the weekends. Runs great all week. Prime is solid so I'm at a lose
     
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