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Thread: Low Pressure pump control??

  1. #1
    Tuner in Training
    Join Date
    Nov 2014
    Posts
    38

    Low Pressure pump control??

    I'm clearly doing something wrong, or having issues with my setup. I'm not able to get good control over my low side fuel pump(s).

    Setup -
    * Stock C7Z pump
    * Add-on Weapon-X low side system
    * 5 PSI Hobb switch
    * No additional FPR for low side pump
    * confirmed working by bridging Hobb switch

    I'm not dropping low side fuel pressure during the pull, but the issue I'm having is that I'm not able to get it to provide more than 58PSI of low side pressure. In the log/tune attached, it's commanding 87 PSI, but the fuel pressure delivered is unchanged.

    Any input on what may be causing this to not react as expected?
    Attached Files Attached Files

  2. #2
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,264
    Did you set your FPR for the secondary kit to 72psi?

  3. #3
    Tuner in Training
    Join Date
    Nov 2014
    Posts
    38
    The secondary kit doesn't have a FPR. I guess that's the way Weapon-X designed it.

  4. #4
    Tuner in Training
    Join Date
    Jun 2015
    Posts
    48
    have you tried setting your normal desired fuel pressure to 72 psi? Just to make sure that the pump that is being commanded to make 72psi, actually is. Your external pump does not have a commanded fuel pressure. What is the high pressure bypass on that pump that weapon X uses?