2012 Peterbilt 386 cranks but no start.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jrry, Nov 29, 2020.

  1. Jrry

    Jrry Bobtail Member

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    Jun 4, 2016
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    I have 2012 peterbilt 386. I have problems with it cranking up. It takes couple tries to get it started then drive for couple hours turn it off and again takes couple time to start. I have change the starter and sent it back to have it checked and came back good. Replace new batteries, alternator, ignition switch. The mechanics can’t find the problem. Has anyone had the same issue with their trucks. I’ll appreciate any info.
     
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  3. AKDoug

    AKDoug Light Load Member

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    Mar 21, 2018
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    Lets get the terminology correct first. Is the starter failing to turn the engine? Or is the starter turning the engine and the engine is not firing? What brand of engine?
     
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  4. Jrry

    Jrry Bobtail Member

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    Jun 4, 2016
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    It has a Cummins 11.9. The starter is turning the engine but the engine is not firing.
     
  5. stillwurkin

    stillwurkin Road Train Member

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    Dec 2, 2017
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    Someone knows for sure. Isn't there a check valve of sort to keep fuel up in the upper part of supply? Sounds like your cranking and cranking to get fuel primed again? Air, electricity, and fuel. Main things it needs. Runs good after it gets fired up? Just my guess though.
     
  6. AKDoug

    AKDoug Light Load Member

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    Sounds like you're losing prime somewhere or the lift pump isn't working. I've never worked on a 11.9, but on my ISX I've replaced the electric lift pump twice. You should hear it run for a minute or so after you turn the key to the "on" position. Double check that your fuel filters are in good condition and sealed properly. Look for any leaking lines.
     
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