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Craftsman Lawn Tractor will only run in full choke

I have a craftsman 18HP (Briggs&Stratton) DYT 4000 (Model 917273634). It sat over the winter with a little gas in it. Ran fine when I put it away. Now when I start it, it only runs when its in full choke and sputters even then. I've removed the carb and checked all the jets and passages, they're clear. I know its fuel related because I've gotten the engine to run by spraying carb cleaner into the intake throat. This way it runs wherever I put the throttle. I'm aiming know at the filter and pump. Any history of this engine losing vacuum for the pump? Is there a one way check valve from the tank to the pump? I ask because I cannot get air to blow back into the tank.

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  • jrhii Jun 25, 2009

    I checked clearance on all the jets. Another thing I tried I checked is that the solenoid on the bowl was working, it was. I changed the filter and still have the same problem. It just seems like its not getting enough fuel. I'm going to run a separate hose into a gas can and see if the pump draws it up. If not, perhaps I'll change the pump.

  • jrhii Jun 25, 2009

    I checked clearance on all the jets. Another thing I tried I checked is that the solenoid on the bowl was working, it was. I changed the filter and still have the same problem. It just seems like its not getting enough fuel. I'm going to run a separate hose into a gas can and see if the pump draws it up. If not, perhaps I'll change the pump.

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When you had the carb off did you clean the low jet with a welding tip cleaner? This solves most lawnmower hibernation problems. Next year empty the fuel tank completely and spray a little WD40 or an eqivalent into the tank and plug hole.

Posted on Jun 20, 2009

  • Dana Newcombe
    Dana Newcombe Jun 20, 2009

    When you had the carb off did you clean the low jet with a welding tip cleaner? This solves most lawnmower hibernation problems. Next year empty the fuel tank completely and spray a little WD40 or an eqivalent into the tank and plug hole.

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