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Thread: bobcat 250

  1. #1
    Join Date
    Nov 2009
    Posts
    1

    Question bobcat 250

    i have a bobcat 250 with an onan motor it is a couple of years old with very low hours. it will run on idle with the choke out and the same at full r.p.m. but when you push the choke in it dies out .it is starving for fuel i have put a new fuel pump on it and a new fuel filter on it but nothing changes.the fuel filter shows very little fuel getting thru it.i have blown out all hoses ther is no restrictions.

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,590

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    Either you neglected to hook your vacumn fuel pump hose up,the hose itself is not attached to the intake plenum, the hose itself is cracked, or your missing vacumn on one of your cylinders due to a failed spark pug, pushrods or other.

  3. #3
    Join Date
    Dec 2007
    Location
    Oklahoma
    Posts
    695

    Smile

    Quote Originally Posted by moormach96 View Post
    i have a bobcat 250 with an onan motor it is a couple of years old with very low hours. it will run on idle with the choke out and the same at full r.p.m. but when you push the choke in it dies out .it is starving for fuel i have put a new fuel pump on it and a new fuel filter on it but nothing changes.the fuel filter shows very little fuel getting thru it.i have blown out all hoses ther is no restrictions.
    Just looking at the fuel flow through the filter is very deceiving.

    Griff

  4. #4
    Join Date
    Aug 2009
    Location
    Ohio
    Posts
    82

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    Pull the gas hose off the carb and stick it in a jar and crank the engine over and see if it's pumping gas,if it is i would say it's in your carb.
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  5. #5
    Join Date
    Jan 2007
    Location
    S.W. Missouri
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    154

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    I don't know if your Onan has the fuel shut off solenoid or not but if it does it might be worth checking. It will be screwed into the carb somewhere and have one or two wires running to it.

    Here's a link to a post on a problem I had very similar to yours but was on a Robin engine.

    Scroll down and there is a picture of it. On mine the rubber tip slid out and was partially shutting the fuel off.

    http://www.millerwelds.com/resources...hortarc&page=2
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  6. #6
    Join Date
    Sep 2009
    Posts
    7

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    I'm no Onan expert, but from my experience with small engines and older gas tractors, it sounds like a classic case of a clogged jet in the carburetor. After you've checked the fuel flow as suggested above and it's OK, then take the carb apart, remove the jets, and blow them out. If it's not too expensive, it's better to get a carburetor kit so you'll have new gaskets and be able to do it right. It's a pretty simple job.

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