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Lawn tractor uses excessive fuel

Runs rough when cold. Has power loss under heavy load. Has some black smoke from exhaust.

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  • jandjake81 May 17, 2009

    spark is good and Installed new plugs. Engine must be partially choked when running to keep it running smooth.

  • jandjake81 May 18, 2009

    carb. and cylinder used to flood between uses before I installed a fuel shutoff

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This sounds like you may have weak spark because you are seeing unburnt fuel coming out of the exhaust, which is black smoke. However, it could be possible that your valves are not seating correctly or that your valve lash needs to be adjusted. Or, your compression is low. First, do a compression check, should be at least 100psi. Second, bring engine upto top dead center, apply 30psi of air into the spark plug hole and try to listen for air weaping either out of intake, exhaust, or breather. This will let you know what valve is faulty or if your rings are shot. Third, check your spark with a spark plug tester. Place the gap a 1/2" apart and turn over engine. You should have a nice blue spark across the gap. If it is orange looking, then replace all of the ingnition parts.

Posted on May 17, 2009

  • mamicheddy
    mamicheddy May 17, 2009

    Before starting your engine, check to see what position the throttle plate is in. It should be partially closed when you first start the engine and opens as the engine becomes warmer. Unless it's controlled manually. If it runs rough at open throttle and spark is ok then try to close the flow valve at the bottom of carb to see if it starts to run better. It's possible that it's just a flow problem.

  • mamicheddy
    mamicheddy May 19, 2009

    If carb and cylinder flooded between uses this means that the float is not sitting correctly in the carb. Make sure that the float is aligned straight and that the rubber needle seat is in tact. This means that you have to take the carb apart.

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Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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