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  1. #11
    Veteran Member yelbike's Avatar
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    Near Winnipeg, Mb, Canada
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    John Deere 2305, 2320,Z465

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    Quote Originally Posted by Dana Warner
    I agree with the fuel shut-off but just wondering if you checked the oil to see if gas has gotten into it?
    Oil is fine but good thought.

    When DW took the air filter to clean it off, she said she saw a little fuel sitting at the bottom of the "elbow" between the filter and the carb.
    Carefull what you aim for, Aim for nothing and you will achieve it with amazing accuracy.

  2. #12
    Silver Member
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    Sep 2011
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    121
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    South eastern Pa.
    Tractor
    kubota B26

    Default Re: Gas coming out of the exhaust on start up

    I just went through the same thing with an 18 Kohler engine. Smell the oil I bet it smells like gas and I bet the oil level is high. The float needle valve has a rubber tip and it does not like ethanol. I am told this is a very common problem. You can just put a shutoff valve on the fuel line but that won't solve the problem. Everytime you shut down the engine some fuel will run into the cylinders. You need a carb rebuild kit.

  3. #13
    Veteran Member David_Kb7uns's Avatar
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    Aug 2005
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    Willamette Valley Oregon
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    Kubota X 4

    Default Re: Gas coming out of the exhaust on start up

    Had a 1999 Murray with a 19.5HP Briggs twin that you had to run partial choke on because the low speed jet was plugged. Ran a half bottle of Berryman b12 chemtooln through the carb and after cleaning the jet out twice more the inside of the carb now is just about as clean as new. Had a push type line more that had not been run in over a year and ran rough on start up and poured Seafoam in the tank and ran for another 15 minutes or so and you could hear it clear up and run smooth. So I am now becoming a believer of some of these fuel additives and try them before a carb disassembly.

    David Kb7uns
    Grand L3130GST LA723 Loader, ATI grapple, ATI grapple bucket, WR Long front remote, Kubota rear remotes, Bradco 408 Backhoe with thumb, 60"KK brush hog, 60" RM Finish Mower, Speeco Post Auger, 72" KK rear blade, 60" box blade
    BX2230 LA211, RCK60, GCK60 Bagger,42"Land Pride Tiller, XB BB, XB RB, rake, Fimco 3PT sprayer
    G2160 RCK60 Mower
    RTV1100 Orange, Work Lights, Front Rear Winch,Rear Screen, High Mount air cleaner, water seperator
    2010 Polaris RZR 800 S
    2007 CAN AM Outlander 800 LTD

  4. #14
    Veteran Member yelbike's Avatar
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    Near Winnipeg, Mb, Canada
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    Well tonight i finally had time to pull the carb out and apart. I cleaned it good, there wasn't much of anything inside as for gunk or sediments. So i still quite stumped as to why it sprays gas out the exhaust on cold start up. What else could it be?
    Carefull what you aim for, Aim for nothing and you will achieve it with amazing accuracy.

  5. #15
    Veteran Member yelbike's Avatar
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    Near Winnipeg, Mb, Canada
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    Quote Originally Posted by Dana Warner
    I agree with the fuel shut-off but just wondering if you checked the oil to see if gas has gotten into it?
    No gas in the oil.
    Carefull what you aim for, Aim for nothing and you will achieve it with amazing accuracy.

  6. #16
    Silver Member George the Beagle's Avatar
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    May 2011
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    138
    Location
    Southern Maine
    Tractor
    BX 1860

    Default Re: Gas coming out of the exhaust on start up

    I agree with Don White. This is a very common problem.

  7. #17
    Silver Member
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    Nov 2007
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    123
    Location
    West Bridgewater, MA
    Tractor
    Kubota B5200, L3540

    Default Re: Gas coming out of the exhaust on start up

    Is it possible the air filter is dirty enough to be acting like a choke and causing it to pull excessive fuel from the carb.???

  8. #18
    Veteran Member yelbike's Avatar
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    Quote Originally Posted by JOHNINMA
    Is it possible the air filter is dirty enough to be acting like a choke and causing it to pull excessive fuel from the carb.???
    Thanks, but nope. I changed both filters in the spring and i blow it clean every few hours with compressed air just like they say not to do.
    Carefull what you aim for, Aim for nothing and you will achieve it with amazing accuracy.

  9. #19
    Super Member crazyal's Avatar
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    Dec 2003
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    Northern Vermont

    Default Re: Gas coming out of the exhaust on start up

    Did you try shutting off the fuel to see if it stops the problem? If it does then I would say either the float valve is leaking or the carb has a defect where a tiny bit of gas is getting around the float valve. Not enough to cause you issues while the engine is running but after a week of sitting enough leaks by to cause you starting problems. One test I like to do when I have the carb off is to blow air (by mouth on a clean hose) where the gas goes into the carb. With it upright air should go in freely but upside down the needle valve will not allow it to enter. Riding mowers have an electronic shut off valve that may prevent the test from working unless you energize it.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  10. #20
    Veteran Member
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    Jul 2009
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    IL
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    B2710

    Default Re: Gas coming out of the exhaust on start up

    Install a spark plug in the exhaust, you'll have an afterburner.
    I have a 25 hp kaw in my Toro ZTR, it has a fuel pump. If yours has a fuel pump it can't be leaking fuel by gravity into the carb or cylinders. One test you could do is remove a spark plug before you try a cold start and see if there's really fuel in the cylinder, either by the sniff test or poking end of rag in there to see if it gets any fuel on it. If no fuel, the problem is narrowed down to something during the cold start, which points to the choke and running way too rich on startup.
    Kubota B2710, New Holland CM274 front mower, Toro Zmaster ZTR, Ford 908 bush hog, New Idea manure spreader, Swisher trail mower

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