Kohler CV20S fuel problem

Discussion in 'Mechanic and Repair' started by wingsinger1, May 7, 2006.

  1. wingsinger1

    wingsinger1 LawnSite Member
    Messages: 1

    I've got a Ferris with a Kohler CV20S engine that runs fine for 30 minutes, then is suddenly starving for fuel. I can reduce the throttle speed and pull out the choke to keep it running. I have to wait for it to cool down completely before it runs normal again. The engine has 2200 hours.

    I've replaced the fuel filter, air filter, choke cable, cleaned the tank, and replaced the fuel lines. I've also cleaned the carburetor. I notice oil coming out the fuel pump breather vent when it acts up. It has a vacuum/pressure line running from the crankcase to the fuel pump. The fuel pump diaphragm appears to be in good shape.

    Any clues as to what to check next?

  2. thecrankshaft

    thecrankshaft LawnSite Member
    Messages: 172

    If there is oil coming out of the filter on the fuel pump then the fuel pump diaphragm is torn. Oil shouldn't be in the fuel pump pulse hose to the crankcase, either. I'd check crankcase pressure as well. However, with a leak in the crankcase, this may cause pressure in the crankcase.

    I'd replace the fuel pump and then check crankcase pressure.

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