redkneck Posted June 29, 2011 Report Share Posted June 29, 2011 My craftsman 18hp briggs will run about 20 minutes then shut down abruptly. Gas cap vent works good, mower will actually restart immediately then run for about 2 minutes then shut down again, will restart again, shut down in about one minute.... etc. I'm thinking coil failure under high temps. Fuel supply seems steady. thanks for the tips in advance! Quote Link to comment Share on other sites More sharing options...
terry264 Posted June 30, 2011 Report Share Posted June 30, 2011 If the fuel filter is okay, then check the air filter. Just had one do same thing due to air filter. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted June 30, 2011 Report Share Posted June 30, 2011 Check the fuel filter and air filter like Terry said. Could be the coil too like you said after it gets hot. Get it to the point where it won't start and pull the plug wire off and see what the spark looks like if there's any. If it's a crappy orange spark that'll hardly jump a small gap that's probably what it is. Quote Link to comment Share on other sites More sharing options...
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