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  1. #1
    Join Date
    Aug 2018
    Location
    Nebraska
    Posts
    88

    Default Fuel Pump issue ??

    Hey guys . So last week got the boat ready for the water ( weather here has been crap) . Boat started up just fine and let it run 2 mins or so . Now my brother owns a service shop and we have done a ton to this boat . So , was running fine then idled down and died , started again and ran for about 30 seconds then turned it off . Went to the lake , wouldnt start , would crank but not start . Looked at the injector pulse and they are shooting fuel however my brother said not enough to get her started . Went back to his shop . Push a Pressure guage on the fuel line ...went to 30psi bouncing then slowly dropped and engine died . Pulled the fuel lines off the low pressure pump and no fuel coming from tank . Blew out the lines, checked the connection on tank , cleaned all those . Pulled the filter off the High pressure pump , filled with fuel , started right up and held at 30psi with out issue ...was running great . My brother suggested moving the Low pressure pump to the rear of the boat close to the tank since they are not meant to SUCK fuel as they are to PUSH (pump) fuel . He said he doesnt understand why they do this in marine applications . So i got home , moved the Low pressure pump to the rear of the boat , new line from tank to pump and used the existing line to connect to the High pressure pump up front . Vented the air by turning the pump On and Off listening till i heard a good solid sound at the High pressure pump. Boat started right up and idled great . Put the FAKE LAKE on the boat and went to start ....SAME DAM ISSUE wont start now, just cranks . My brother is saying take the line off to the High pressure pump and cycle the fuel pump to make 100% sure fuel is reaching the HP Pump . Have yet to do this

    Any thoughts as to what else it could be ?

  2. #2
    Join Date
    Aug 2018
    Location
    Nebraska
    Posts
    88

    Default

    Ended up being the fuel pump itself . Bought new and started right up . I can tell you the moving of the pump DID help !! Primed extremely fast , fuel pressure was right on and steady . Would suggest this on these boats but not 100% necessary

  3. #3
    Join Date
    Feb 2012
    Location
    Murrieta, CA (SoCal)
    Posts
    74

    Default

    Glad you worked it out. What boat / engine are you working with? I'm a little unclear on what boat you have with a low and high pressure pump.
    - John

    2002 Outback LSV

    "A towel, it says, is about the most massively useful thing an interstellar hitch hiker can have."

  4. #4
    Join Date
    Aug 2018
    Location
    Nebraska
    Posts
    88

    Default

    2001 moomba Mobius ...has been NOTHING but issues since purchase haha !! But slowly and surely working things out on it . Was neglected by prior owner pretty bad

  5. #5
    Join Date
    Feb 2012
    Location
    Murrieta, CA (SoCal)
    Posts
    74

    Default

    Neglect can make a great boat a pile of junk in a couple seasons. Sounds like you've got it under control though.

    Sent from my Pixel 3 XL using Tapatalk
    - John

    2002 Outback LSV

    "A towel, it says, is about the most massively useful thing an interstellar hitch hiker can have."

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