2006 peterbilt 379 cat c15 mxs on going fuel issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 379_dannyy_geee, Jun 22, 2019.

  1. spsauerland

    spsauerland Road Train Member

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    Looks like there is a compucheck fitting behind your hand primer pump. Pop the cover off and get a compucheck quick disconnect adapter.
     
    Oxbow, anthonyar4, Wheeljack and 2 others Thank this.
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  3. anthonyar4

    anthonyar4 Medium Load Member

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    Am I able to just take the fitting off and install something. I have a fuel pressure kit from harbor freight.
    E903B990-9562-4F6A-A852-60DD8D2C2655.jpeg
     
  4. Goodysnap

    Goodysnap Road Train Member

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    You will need a compucheck coupler attached to a fuel pressure gauge. Any hydraulic hose shop should have what you need or atleast be able to order. You can take the fitting with you to match.
     
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  5. Shawn2130

    Shawn2130 Heavy Load Member

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    FDEED3DC-723C-4391-A895-AE02DAE4BAEC.jpeg

    This is how I set up the fuel pressure gauge when I’m looking for running issues with this 3406E.

    I have it on right now to help with starting issues.

    I went to a hydraulic hose shop to get a fitting to hook the hose to.
     
    Wheeljack and spsauerland Thank this.
  6. anthonyar4

    anthonyar4 Medium Load Member

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    Everyone I talk to says it’s a dealer part
     
  7. Goodysnap

    Goodysnap Road Train Member

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    Not nearly. Google compucheck coupler, you can get them anywhere.
     
  8. anthonyar4

    anthonyar4 Medium Load Member

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  9. anthonyar4

    anthonyar4 Medium Load Member

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  10. anthonyar4

    anthonyar4 Medium Load Member

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    I’m about to test fuel pressure. I adjusted the peddle calibration by turning on key then pressing and releasing peddle 3x. It went from 83% to 97% which I assume is normal because if it goes over 100% I’m told it will back down. Also found my floor mat was getting under peddle. On initial rev I noticed a lot more power. Will check fuel pressure and post results. Still in search of a tune for a 6NZ rated at 550hp 1250 tq. As my engine is a MBN
     
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