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Briggs and Stratton 3.5 push mower. rebuilt the carb and runs great but after 15 minutes the primer bulb sucks in and it starves out of fuel

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You may experience this problem because your ignition coil is failing when it gets hot. Make sure the cooling fins on the flywheel are not plugged up. You will probably have to replace the coil.

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Fuel delivery; not iginition unless timing is retard enough to cause over heating due to lean burn condition. If so check crank shaft key to see if partialy sheared, but highly un-likely
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How old is your lawn mower?!

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Wrong diaphram in carb, or missing check valve(ball) following primer bulb inside carb housing

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