Port and Starboard Engine fuel consumption different

Discussion in 'General Maintenance/Repair Questions' started by steelheder, May 31, 2011.

  1. steelheder

    steelheder Member

    40
    Sep 1, 2009
    Puget Sound
    290 Sundancer 2000
    Twin 5.7 EFI w/ Bravo 3's
    I know that the Port or Starboard engine will consume different amounts of fuel but I'm wondering if mine are more than acceptable.
    On plane at 3,300 rpms with medium load I'm doing 24 knots and using 8 gpm on Port engine and 11 gpm on Starboard. No noticable issues w/ anything, recent tune up and always been this way. Please tell me what you think or if you have a similar boat and what you burn.

    Thanks, Russ.
     
  2. BonBini

    BonBini New Member

    685
    Sep 28, 2009
    Great Lakes
    88 268
    7.4L Alpha One
    That would drive me nuts.

    If it were me I would pull a couple easy to get to plugs and compare how each engine was burning. If things looked good, then move on to the fuel flow sensors. Maybe swap to see if the problem would move to the other engine.
     
  3. HUMPH

    HUMPH Well-Known Member GOLD Sponsor

    Nov 4, 2009
    SF BAY AREA
    2003 410DA,
    2009 Walker Bay 13’
    CAT 3126TA's 350HP/
    50HP Honda
    Do you have a generator?
     
  4. steelheder

    steelheder Member

    40
    Sep 1, 2009
    Puget Sound
    290 Sundancer 2000
    Twin 5.7 EFI w/ Bravo 3's
    No visible difference in plugs, both engines appear to be running great. 2 years of running with no change in flow rates. Both have been tuned, new plug wires, plugs, caps, rotors, oil, filter, fuel/H20 filter, drive gear lube, props look great, drives trimmed the same.

    As for generator, yes I have one but this is real time running.

    Thanks for the suggestions, Russ.
     
  5. BonBini

    BonBini New Member

    685
    Sep 28, 2009
    Great Lakes
    88 268
    7.4L Alpha One
    How bout swaping sensors or having there calibrated checked some how?
     
  6. Phlorida

    Phlorida New Member

    867
    Sep 15, 2010
    Satellite Beach, FL
    1995 250 Sundancer
    5.7L Mercruiser w/Bravo II
    I agree with Ron - swap the sensors at this point. A 25% plus differential between the engines is big, especially for it to come on suddenly.
     
  7. themikehyde

    themikehyde New Member

    629
    Nov 6, 2009
    Potomac River - Colonial Beach
    2001 280 Sundancer
    Twin 4.3's
    Russ,
    What device are you using to show this,. a Floscan?
    Mike
     
  8. Bucit

    Bucit New Member

    Mar 12, 2010
    St. Petersburg Florida
    2005 280 Sundancer
    2004 SPD-104 Achilles w/ 8hp Yamaha
    Twin 4.3 MPI's with Alpha drives.
    I have a differnce too but it's the port motor that burns more fuel. The differnence though is no where near yours. I'm like .5GPH difference at worst. I assumed this was because the port motor is actually running in reverse and not as efficient?
     
  9. matthewmiller01

    matthewmiller01 New Member

    May 14, 2008
    Knoxville, TN
    2008 290 Sundancer
    Twin 5.0 MPIs (DTS) w/ Bravo III Drives
    Kohler 5 ECD
    As Mike asked, what are you gauging this by (Floscan, Smartcraft indication)?
     
  10. steelheder

    steelheder Member

    40
    Sep 1, 2009
    Puget Sound
    290 Sundancer 2000
    Twin 5.7 EFI w/ Bravo 3's
    Using Lowrance LMF 400. Have not switched sensors but have recalibrated them. Guess I'll switch em and see what happens.

    Russ.
     
  11. Pseudomind

    Pseudomind Active Member

    Jul 1, 2008
    Jacksonville, FL
    2011 Hurricane with Magic Tilt Trailer
    115 HP Yamaha Four Stroke
    I know you have inboards, but I would take a serious look at your props and have them reconditioned. Have a look here, I could not believe the difference made, and it corrected issues I had been chasing for over a year.

    Props
     
  12. steelheder

    steelheder Member

    40
    Sep 1, 2009
    Puget Sound
    290 Sundancer 2000
    Twin 5.7 EFI w/ Bravo 3's
    I thought about having it done but just haven't yet. Think I will now and see if that does it. Thanks for the tip Pseudomind.

    Russ.
     
  13. C.W.

    C.W. New Member

    32
    Jul 28, 2010
    Kent Island
    310DA
    T5.0
    Does one side run cooler than the other? a rich running engine runs cooler. A simple thermostat stuck open could also cause problems when not warmed up.
     

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