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Thread: HPFP Crashing

  1. #1
    Potential Tuner
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    Jan 2021
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    HPFP Crashing

    Hello, I have replaced my HPFP, LPFP, and the fuel feed line to the HPFP with one without the check valve. When I go WOT the lPFP comes in strong right around 70PSI while the HPFP crashes to 3-400. My injector duty cycle is roughly at 45% and the Inj Pulse is slamming at 12.5. I'm pretty sure that's about twice the PWM you want for the stock LT1 injector. The car is a 2014 Corvette Z51 with Manual trans It has TSP long tubes 1 7/8, no cats, and I just added a Procharger P1sc with a 4" pulley that should make 6-7 lbs of boost tops. I would think the factory fuel system would support this from what multiple vendors have told me. I've only been using VCM for a few days for data logging. I would love some help with this issue. I'll attach my latest log file. If there is any data I can add to the log to help figure this out I'll add it and re-log. Thanks in advance!
    Attached Files Attached Files

  2. #2
    Advanced Tuner
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    Dec 2015
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    Miami,Fl.
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    Which hpfp and lpfp? Got to be specific.
    2023 Ford Maverick 2.0T AWD

  3. #3
    Advanced Tuner
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    Aug 2014
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    Central, LA
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    If you're putting lt1 stuff back on you are just overrunning it more than likely.

  4. #4
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    Quote Originally Posted by HeavyChevy305 View Post
    Which hpfp and lpfp? Got to be specific.
    Sorry about that, Its a Delphi LT1 HPFP and an ACDelco stock C7 LPFP.

  5. #5
    Advanced Tuner
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    Dec 2015
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    Miami,Fl.
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    So basically a stock LT1 fuel system. Post tune...
    2023 Ford Maverick 2.0T AWD