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I have a White Outdoor LT-1855 H Lawn Tractor with a 18horse Briggs and Stratton engine. I started having a problem with it shutting down after running for a while. Seems to shut down when it gets hot. It will run fine and I can mow for about 15-20 minutes then it shuts off. If I wait for a while for it to cool it will crank and run for a short time (maybe 3-5 minutes) and shut off again. I have tried to correct the problem doing the following Changed out the Spark Plug Changed the Ingnition Coil Dumped the gas and put fresh in. Changed the fuel filter Loosened the gas cap to make sure it wasnt a faulty cap. Pulled the Air filter to eliminate a bad clogged air filter. Charging system seems fine getting 14 volts at the battery when running. I am not sure where to go at this point. Any help would be greatly appreciated! MikeQ
Does it just shut off or does it sound like it starves out and quits? UPDATE If the gasoline vent cap is clogged your engine will run for a while but then starve out as a vacuum starts forming in the gas tank. Once it dies, air seepage into the gas tank will occur equalizing internal and external air pressure. You engine will then be able to start again. Clean the vent cap out to allow air to enter the tank as the gas is consumed and your issue may be resolved.
