Is this true?

Discussion in 'Lawn Mowing' started by BrianK10, Jul 6, 2004.

  1. BrianK10

    BrianK10 LawnSite Senior Member
    from usa
    Messages: 252

    Hey all.

    Met up with a friend today to do weekly maintenance on our equipment. When I pulled up to his building, he took notice of something that I never thought, nor heard about before. He says he turns his fuel knob off on his walkbehinds before transporting them on his trailer. He says if you hit a bump, fuel can get lodged in the carb and start problems, or something like that. He suggested I try and start doing it. So, here I am, confused. Fact or Fiction? Good or bad? Seems lodgical, but I've never had problems starting my mowers. What do you say?

  2. dfor

    dfor LawnSite Senior Member
    Messages: 829

    He is correct. I always had to do it on my 14 hp Kawasaki, but never have to on my 17 kawi. Not as of yet anyway.
  3. Gilla Gorilla

    Gilla Gorilla LawnSite Senior Member
    Messages: 923

    It is good practice. But I very rarely do it.

    Think if one of your fuel lines has a stress point in it somewhere, you hit a bump and something else on the trailer hits the line. Then you have a couple of gallons of fuel draining all over your mower and trailer. Very likely to happen but it could.
  4. Norm Al

    Norm Al LawnSite Bronze Member
    Messages: 1,227

    it depends if your carb has a FLOAT in it....the float can bounce alowing more fuel to go into the cylynder,,,,efectively flooding it some so its harder to start!
  5. specialtylc

    specialtylc LawnSite Bronze Member
    Messages: 1,656

    Most engines say to shut off the fuel when transporting. But I never do. Never had a problem yet in 8 years.
  6. Flex-Deck

    Flex-Deck LawnSite Silver Member
    Messages: 2,845

    My yards are a heck of a lot rougher than my trailer is. Should I shut the fuel line off when mowing??????? I certainly would not like to lose 2 gallongs of fuel while mowing!!!!!
  7. locutus

    locutus LawnSite Bronze Member
    from NC
    Messages: 1,266

    I have never shut off the fuel while transporting my mower. No problems in 12 years.
  8. Tharrell

    Tharrell LawnSite Silver Member
    Messages: 2,967

    The bouncing float will eventually mess up the seat of the jet and fuel will seep into the cylinder and then down past the rings into the crankcase mixing with the oil. It won't stop the wear but, it will stop fuel from seeping. I do it EVERY time I turn my mower off.
  9. LynyrdSkynyrd

    LynyrdSkynyrd LawnSite Member
    Messages: 179

    Your friend is correct.
    Most newer small engines have a "duck Bill" or other type of check valve in the cap on the fuel tank. They prevent fuel from escaping while allowing the tank to vent or breath.

    This can cause excess pressure to build in the tank from the sloshing fuel during hot weather. If the fuel to the engine is turned on and the float bounces up and down while transporting the excess pressure in the tank can force fuelinto the carb causing flooding.

    I turn all of my fuel valves when transporting just to ease my own mind.

    If your float needle and seat are kept in good shape you may go for years and never have a problem. Then you may hit a bump tomarrow and flood every engine on your rig.
  10. 65hoss

    65hoss LawnSite Fanatic
    Messages: 6,360

    All my machines have the fuel shut off when not in use. Whether on the trailer or in the shop. I had it go thru the carb once and dump 1/2 a tank of fuel into the crankcase. Will not have that happen again.

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