Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    Join Date
    Apr 2015
    Location
    Locust Grove, VA
    Posts
    2

    Default Fuel Economy 2004 Moomba Outback

    How much fuel are you guys burning per hour during normal skiing condition in a 2004 Outback? We are mostly slaloming around 28 to 30 mhp. I have the feeling I'm burning way to much and not sure what to do about it.

    We just bought the boat after it sat for 3 years, we have done a lot of work on it to get it back to "as good as new" shape. BUT after using it only a few hours I have the feeling we are burning close to 9 gallons per hour?? I was expecting 6 to 7 gallons an hour during normal skiing. The motor runs beautiful and only has 185 hours on it.

    Any suggestion on where to start looking?

    Thank for helping A newbie!

  2. #2
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,199

    Default

    The general consensus for the Outback was around five gallons per hour plus or minus a gallon. Nine gallons per hour would be excessive.
    1998 Mobius
    310 HP PCM

  3. #3
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,813

    Default

    You may not have it propped right for your application. If the previous owner was using it for wakeboarding and had a lower pitched prop you will have to run much higher RPM's at ski speed. So, what size/pitch prop are you running and what RPM are you running at speed?
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  4. #4
    Join Date
    Jul 2002
    Location
    London Ontario Canada
    Posts
    1,938

    Default

    My outback typically ran 30mph at 3000rpm. Although I never tracked it WOT cumsummed about 8gal per hour. I had the carbed 310 so would expect a mpi to consume less
    09 21v LAUNCH

    run your engine after you change your oil
    68 th Member. WS420,HSE Revolution, OJ 466, Acme1157,1100 sacs,Kicker HLCD's n IX500.4, Supra Coolies
    Doug

  5. #5
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,813

    Default

    I think the general rule or baseline was always that a 13 x 13 prop would run 3000 RPM at 30 MPH.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  6. #6
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,199

    Default

    Quote Originally Posted by kaneboats View Post
    I think the general rule or baseline was always that a 13 x 13 prop would run 3000 RPM at 30 MPH.
    X2. Mainly for waterskiing to which it was designed.
    1998 Mobius
    310 HP PCM

  7. #7
    Join Date
    Jan 2014
    Location
    Illinois
    Posts
    18

    Default

    I have the 03 outback carbed. I also agree with the 13x13 3000rpm 30mph. I can't say i have ever tried to measure fuel consumption but I'm wondering how you measured. My gas guage flops around so much it would be hard to tell exactly how much I have or how much i used.

  8. #8
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,813

    Default

    Fill the tank, keep track of your run time. Fill the tank again. Note the number of gallons from the second fill. That's what you burned. Divide that # by the hours elapsed run time.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  9. #9
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,199

    Default

    Quote Originally Posted by fu-man View Post
    . My gas guage flops around so much it would be hard to tell exactly how much I have or how much i used.
    That is the reason many of us have a general idea of the consumption because the gauge is rather useless. Besides knowing on my boat that when the gauge reads "E" there is about five gallons of gas left. I just pay attention to the hour meter after a fill. Not exactly rocket science but more accurate than the gas gauge.
    1998 Mobius
    310 HP PCM

  10. #10
    Join Date
    Apr 2015
    Location
    Locust Grove, VA
    Posts
    2

    Default

    Thanks Guys!

    That is exactly what I'm doing, I filled up all the way and well see where we stand after I run 3 hour or so hours and I fill up again. The fact that that there could be 5 gallons or so left in the tank when it reads E might be why I'm concerned.

    I replace the spark plugs but did not check if they were gapped correct, Have any of you seen a difference in FE after re-gapping them? (its on the to do list for tomorrow).

    Thanks!
    --
    Jordy
    2004 Outback

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •