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I have a weedeater series 300 lawnmower. When I prime it, it will run for about 5 seconds and then stops. It burns off the gas from priming it and then cuts off. If I do this about 20-30 times then it will run, but by then I'm too tired to cut the lawn.

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  • buzz1057 May 11, 2010

    get a new motor for it


  • Dino Jun 05, 2013

    I had the same problem and I put a hotter plug fresh 93 octane gas and the correct 2 stroke outboard oil gas additive and have had no more problems lukes oil also e s gas

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Thats a common problem with those briggs motors. There is a plastic tube that goes from the back of the carb to the other side of the motor. There are two small bolts that hold the tube down opposite the carb end of the tube. They loosen over time allowing to much air to get in. Also the tube cracks but not to often. If that doesn't help you need a kit that comes with a gasket and a diaphram. you may need that because the tube warps were it meets the carb. That should fix it.

Posted on Apr 22, 2010

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The tube that goes to the carb is broke on the other side of motor

Posted on Oct 05, 2009

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It could be a weak plug, dirty filter, or a crack in the primer bulb. If you keep priming once the mower is running, you should check the bulb, which you can get at you'r local small engine shop.Also, make there is no water in tank. if mower is old, you might have to replace the carburator diafram.

Posted on Jun 19, 2009

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