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  1. #1
    Member
    Join Date
    Aug 2012
    Location
    pickles gap ar
    Posts
    2,590

    Hpdi water pressure

    A buddy cannot get much( 2-4 lbs) on 250 hp. Changed pump twice, cleaned popit twice, water coming out water line to gauge. He has checked intake screen and lite air pressure makes gauge work, but not water pressure. Pee stream is strong and no heat alarm. My guess is popit spring week or bad gauge. What's your thoughts?

  2. Member ifishinxs's Avatar
    Join Date
    Jul 2015
    Location
    Southern Utah
    Posts
    7,279
    #2
    Blow compressed air to the gauge to test it. Replace as needed. Replace the pressure relief valve. Is cheap and pretty easy to do and eliminates it as a problem.
    My hpdi idles at 3lbs PsI. Close to 20 PSi at wot.
    2024 Phoenix 818, Mercury 175 (3B414035) Trick Steps, 3 Garmin 106 SV,s, LVS 34. BoatEFX dual bow mount. Ionic 12V 125AH, 2 12V 100 ah LiTime’s with Blue tooth for the TM. Minn Kota 345 PCL charger, Minn Kota Quest TM.

  3. Member
    Join Date
    Mar 2016
    Location
    Michigan
    Posts
    290
    #3
    Yeah, replace the pressure control valve. I had 6psi wide open before I did mine. Back up to 15 instantly after. Had a small buildup of stones inside keeping the valve wedged open I presume and probably wearing out the gasket.

    The pee stream might seem strong now but stand back once the PCV is replaced. Laser beam.
    Pete | 2011 Ranger Z118 | Yamaha HPDI 150