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Thread: TCM Flash - NOW TRUCK WON'T START - HELP

  1. #21
    Senior Member
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    You should maybe study the fuel system on your truck not possible for a flash to cause fuel drain back that would be like your software at work causing a hydraulic fitting to loosen up

  2. #22
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    You can rule out the VATS speculation. In theft mode the truck will fire and die. The fuel delivery system is mechanical aside from the actual injectors. Even the pressure relief is mechanical. Elecronically it can only command the injectors not to open and your fuel pressure is normal when in theft mode.

    I see this all the time and have never thought much of it. One of my LBZs did this yesterday. Prime and go back to work.

  3. #23
    Lifetime Member killerbee's Avatar
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    If you spent a bunch of time cranking over with a VATS (or other) dead issue, then perhaps that is what drained your lines. Just a thought.

    I have flashed thousands of LLY truck, and never had this happen.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  4. #24
    Lifetime Member dansdieselp's Avatar
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    Sounds like you need a lift pump bud. Losing prime is a mechanical problem, not electrical. You have an air leak somewhere in the system. It will happen again, but next time you might not be at home when it does it.
    Dan's Diesel Performance
    www.dansdieselperformance.com

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