How do fuel solenoids work

Discussion in 'General Maintenance/Repair Questions' started by Timothy Berlinski, Jan 21, 2020.

  1. Timothy Berlinski

    Timothy Berlinski New Member

    19
    Jun 16, 2019
    Sundance 290
    5.7 twins
    2001 amberjack 290 specifically generator fuel solenoid. Is it normally closed and then opens with power or normally open and closes if an issue? I ran genny yesterday and it ran few min then died, i didnt have the control pnel set to heneratir cause its not hooked to it but does setting tha switch from shore power to generator open that solenoid?
     
  2. Wanderer 290

    Wanderer 290 Active Member

    130
    Jul 1, 2019
    01 sea ray 290 sundancer
    Twin 5.7 b3’s
    The solenoid is spring loaded and in the closed position when the the generator is not running therefore no fuel flow to the carb. When the generator start switch is activated a electro magnet opens the solenoid allowing fuel to flow to the carb. The solenoid then remains open until the generator dies or is shutdown.
     
  3. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Here ya go hope this helps. https://www.google.com/search?q=fue...imgrc=mLGM5-01ok9aLM:&spf=1579652384065&vet=1

    Fuel injectors are similar to a point.
    https://www.google.com/imgres?imgur...QMwhnKAEwAQ&iact=mrc&uact=8#spf=1579652407178
     
  4. Timothy Berlinski

    Timothy Berlinski New Member

    19
    Jun 16, 2019
    Sundance 290
    5.7 twins
    That makes sense
     
  5. Wanderer 290

    Wanderer 290 Active Member

    130
    Jul 1, 2019
    01 sea ray 290 sundancer
    Twin 5.7 b3’s
    But I don’t think the solenoid is your problem. Probably an overheat condition on either coolant side or exhaust side. the pcb control board or the voltage regulator can also cause a shutdown.
    Note of caution, do not start or shutdown the generator with a load on it because the voltage regulator will fry.
     
  6. Timothy Berlinski

    Timothy Berlinski New Member

    19
    Jun 16, 2019
    Sundance 290
    5.7 twins
    Well generator is basically just in there hooked up to battery its not hooked up to the control panel so generator isnt giving any power to boat yet. And i had the switch on shorepower so thats probably why the solenoid stayed closed and ran out of fuel
     
  7. Wanderer 290

    Wanderer 290 Active Member

    130
    Jul 1, 2019
    01 sea ray 290 sundancer
    Twin 5.7 b3’s
    Actually, as soon as the generator start switch is activated and while it is running the generator supplies the power to the solenoid which keeps it open. So more than likely another fault is causing the shutdown.
     

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