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2.4 gal per hour on Kaw DFI 61" deck using G6

Discussion in 'Lawn Mowing Equipment' started by doublesharp, Aug 20, 2013.

  1. doublesharp

    doublesharp LawnSite Senior Member
    Messages: 364

    I just checked my fuel usage on my Bobcat Predator Pro 61" deck G6 blades Kawasaki 1000cc DFI with 30 hours. I filled the right tank to the brim and then mowed for 15 minutes full throttle @ 3 1/4" in dry grass that was mowed last Tuesday so it wasn't dense. I refilled at the same spot on the drive way using a 1/2 gal pitcher and put in 1 qt at a time being careful and spilling none. It took 78 oz to fill mower back up so X 4 = 2.4375 gal per hour.

    How does this compare to what others are getting? It's about 25% more than I expected it to use.
  2. puppypaws

    puppypaws LawnSite Fanatic
    Messages: 9,148

    My gosh, have you got a hole in a tank, your engine is fuel injected and is burning much more gas than the same exact engine (mine, FX1000V), which is the carburetor model.
  3. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Messages: 16,997

    First, that's not a very accurate way to check fuel consumption.

    Second, the epa buttheads have made it mandatory to have a huge air space in the tank above the filler neck, so while you may have thought you had it full the first time, driving it over the ground for 15 minutes is plenty of shaking to cause the air to escape up around the bottom of the filler neck and lower the level in the tank quickly. To see what I mean, next time you are at a gas station or wherever you fill your tank, fill it to so that the fuel is half way up the filler neck, then shake your machine good while watching. It will go down enough to get quite a bit more fuel in the tank. I can usually shake my machine several times before I get all the trapped air out and the tank full.
  4. MBDiagMan

    MBDiagMan LawnSite Senior Member
    Messages: 852

    My side by side is like that. I can fill the tank to the brim and shake it by the roll bar, put in some more, shake again and so on, and get about another gallon and a half in it. Very frustrating. Why can't I just fill 'er up?

    To the fuel consumption of the OP. If it really IS using that much fuel, that's pretty shocking. Your method sounded good, but maybe there is an issue like Green points out.
  5. CurbAppealKS

    CurbAppealKS LawnSite Senior Member
    Messages: 448

    You might check your machine out, sounds like its running pretty rich to me. Can you smell any unburnt gas in the exhaust?
  6. Valk

    Valk LawnSite Silver Member
    Messages: 2,711

    Repetition will make your stats more valid.
  7. doublesharp

    doublesharp LawnSite Senior Member
    Messages: 364

    I know it's not scientific but I just repeated the test and bounced the mower to be sure it was max full. I was mowing light growth on flat ground and it took 70 oz in 15 minutes or 2.1875 gal per hour using 87 octane 10% ethanol. This mornings test was up and down a shallow hillside and I'm using sharp G6 gator blades. Engine runs strong and there are no fuel smells. I think it's just a gas hog but expect it may get a bit better as it gets more hours on it.
  8. baileylawnservice

    baileylawnservice LawnSite Senior Member
    Messages: 530

    Fill your tank Check your hours, then run it until its almost empty. Recheck your hours and see how many gallons it takes for it to be refilled. Try to use the same gas pump if you can.
  9. baileylawnservice

    baileylawnservice LawnSite Senior Member
    Messages: 530

    My 52" scag ztr with a 25hp kawasaki air cooled uses a about a gallon per hr
  10. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Messages: 16,997

    Well, if your numbers are accurate or at least close, that is high fuel consumption for an EFI/DFI engine, even one as large as yours, without being in tall/thick (8-10") grass the entire time.

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