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Gas leaking into oil

Discussion in 'Lawn Mowing' started by gem, Apr 4, 2005.

  1. gem

    gem LawnSite Member
    Messages: 13

    After watching and learning so much ftrom this site , I finally decided to post.
    I have a Ferris IS 3000 61" deck and the Kawasaki 25 horse engine. Last fall it was leaking gas into the crankcase. I took it to the dealer and they basically had it all winter and replaced the carburetor under warranty. I picked it up last week, drove it from their garage onto my trailer and off my trailer into my garage. Was planning on using it today, checked the oil and there was gas in it again. Anyone else ever have this problem or have any insights? Oh, the machine was new last year and only has 232 hours on it!
  2. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,283

    Curious how you found that gas was leaking into the crankcase? Does the unit start and run okay? Could this problem be occuring when you transport? Try turning off the gas while in transit.
  3. Norm Al

    Norm Al LawnSite Bronze Member
    Messages: 1,227

    there is only one way gas can get into the oil,,,,,and thats going past the rings on the piston!
  4. traman

    traman LawnSite Senior Member
    Messages: 712

    are you sure they changed the oil after the carb fix or is it left over from last year ?
  5. EC-Rider

    EC-Rider LawnSite Member
    Messages: 65

    I have seen fuel leaking by the fuel pump seal and into the crankcase. :eek:

    But mostly on diesel engines, gasoline …very rare, still if it is physically attached to the engine and runs off a cam on the engine block…it maybe worth a look. :help:

    Perhaps someone more familiar with the particulars on this engine can shed more light into this… :dizzy:

    Hope that helps! :drinkup:

    It’s all good! Enjoy! Peace! :angel:


    EC-Rider :waving::
  6. beransfixitinc

    beransfixitinc LawnSite Senior Member
    Messages: 592

    Maybe on that engine.. but on something like a Briggs vertical L head, if the float is no longer functioning, the fuel can/will leak past the carb. into the intake tube and into the engine. Though I suppose it could take your path somehow.
  7. gem

    gem LawnSite Member
    Messages: 13

    Yes, it starts and runs fine. I discovered the gas in the crankcase originally because I check the oil before every start-up and one morning the level was very high on the dipstick and the oil was black and thin and smelled like gas. The dealer told me they changed the oil and filter. They also told me this is a common occurrence on Kawasakis.
  8. SodKing

    SodKing LawnSite Bronze Member
    Messages: 1,641

    OK...not equipment related but...We have a 1958 Volkswagon 3/4 ton pickup where the gas is leaking into the oil pan...any suggestons as to why?
  9. BobR

    BobR LawnSite Senior Member
    Messages: 714

    My 23 hp Kawasaki does the same thing (gas in crankcase), turning the fuel petcock to off when loading the trailer at the end of the mowing day solved the problem.

  10. gem

    gem LawnSite Member
    Messages: 13

    Thanks! I'll give it a try, but I have my doubts that this is the cause. I ran the mower from May to October before this happened. Seems like it would have done this sooner if that was the cause.

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