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  1. #1
    Member
    Join Date
    May 2018
    Location
    oklahoma city
    Posts
    31

    Low water pressure

    Hello guys, I am wonder if you guys can help me with my low water pressure issue. I have a 1990 mariner 175 sn# OC254550 and my water pressure gauge only reads around 4psi at WOT. Ran a new water pressure line and also bought a new gauge. I am NOT getting an overheat alarm and she does pee. I have done the following:

    1) Replaced the impeller, the 3 gaskets, and the impeller housing
    2) Replaced both tstats
    3)Replaced the entire poppet valve assembly and torqued to specs

    Any ideas on whats going on?

    Thanks,

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    94,941
    #2
    Where is the water pressure tubing attached to the engine?


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  3. Member
    Join Date
    May 2018
    Location
    oklahoma city
    Posts
    31
    #3
    I put a t-split in the line going to the tell tale.

  4. Member luvdmymerc's Avatar
    Join Date
    Nov 2005
    Location
    Springfield, Missouri
    Posts
    4,158
    #4
    Uh-oh..... If you get the Mercury brand gauge it will show you exactly where to splice into the system on your particular motor...Very handy..

  5. Member
    Join Date
    May 2018
    Location
    oklahoma city
    Posts
    31
    #5
    Do you happen to know where I should splice mine in?

  6. Member
    Join Date
    Jun 2013
    Location
    LONGVIEW TEXAS
    Posts
    13,938
    #6
    Quote Originally Posted by bwest0615 View Post
    Do you happen to know where I should splice mine in?
    top of block just behind flywheel cover
    .................................................. ...the scariest thing in life is the unknown ...................................