Twin has tanks

Discussion in 'Sport Cruisers' started by Peter Z., Feb 17, 2020.

  1. Peter Z.

    Peter Z. New Member

    9
    Oct 13, 2019
    2009 Sea Ray Sundancer 330
    Mercruiser 8.1 inboard
    Are my twin gas tanks linked or independent? I have a full tank of gas starboard, and 1/4 tank port. Do I need to fill port tank up completely or will the boat draw fuel from either tank?

    Thanks.
     
  2. joeyleggz

    joeyleggz Active Member

    576
    Jan 15, 2013
    long island
    current boat: 1997 sea ray 330 express cruiser
    twin 454's efi
    Tanks are independent but if your boat has the crossover fuel manifold you can switch both motors to draw off one tank
    My manifold is under the starboard cockpit step (330 ec)
     
  3. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    post some pics of the engine compartment and we just might be able to give you an answer.Some have independent systems , some have valves to direct the fuel
     
  4. boatmailster

    boatmailster Well-Known Member

    May 13, 2007
    NY
    none to share
    none to share
    Likely there is selector valve. I would check if you actually have full tank or faulty sender.
     
  5. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
    Mine are independent... no switching valves.
     
  6. FootballFan

    FootballFan Well-Known Member

    Jun 20, 2012
    Florida
    Marquis 59
    MTU Series 60
    Previously had a Sea Ray (47db) which allowed you to switch which tank the Genset pulls from.

    Never saw a Sea Ray which let you switch which tank a given engine pulls from. Just my experience, someone else may have first hand knowledge.

    Go to the fuel dock, see how many gallons your port tank takes till full, compare that to tank size, should give a rough idea if the sender is functioning correctly.
     
  7. joeyleggz

    joeyleggz Active Member

    576
    Jan 15, 2013
    long island
    current boat: 1997 sea ray 330 express cruiser
    twin 454's efi
    356BF5EB-D760-4A85-9BD8-3FF1CE3C69A0.jpeg
    This was a pic from 2002 41sd
    But I have the same one on my 97 330ec .mine was under the step in a compartment in my cockpit
     
  8. FootballFan

    FootballFan Well-Known Member

    Jun 20, 2012
    Florida
    Marquis 59
    MTU Series 60
    There ya go, you have first hand knowledge I didn't.
     
  9. boatmailster

    boatmailster Well-Known Member

    May 13, 2007
    NY
    none to share
    none to share
    630 sea ray for example
     
  10. 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
     
  11. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    Axiom 12 MFD
    Cat 3126 V-Drives
    Id suspect a faulty sender with the readings being that far off...

    if new to you boat...go fill the tanks and document how much goes in each tank.
     
  12. Peter Z.

    Peter Z. New Member

    9
    Oct 13, 2019
    2009 Sea Ray Sundancer 330
    Mercruiser 8.1 inboard
    Thanks everyone. Will investigate further and report back.
     
  13. Creekwood

    Creekwood Well-Known Member GOLD Sponsor

    Apr 26, 2009
    Oakville and Georgian Bay, Ontario
    '97 330 Sundancer, Raymarine C80 suite with radar, Mercury 310 Hypalon w/8hp Yammie 2stk
    2X 454 carbs w/ vDrives
    FYI my 97 330 has valves to pick what tank each engine draws from. I thin it was an option. Never use them though.
     
  14. Peter Z.

    Peter Z. New Member

    9
    Oct 13, 2019
    2009 Sea Ray Sundancer 330
    Mercruiser 8.1 inboard
    I followed up on 3 leads from this thread, but no luck. I found no gas tank switch in the engine bay, at the helm station, or in my cabin as others posted. Might my tanks be auto controlled and auto balanced?

    One helpful tip. I believe my fuel level sender in port tank is stuck, as my calculations of gas bought suggest my port tank would be 3.4 full, not 1/4, as it was before partial fueling. TY All!
     

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