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Trust Jack’s to supply the replacement Small Engine Fuel Pumps and replacement fuel pump diaphragms needed to help your small engine run its best. Over time, ethanol in today’s fuel can cause buildup and clogs that may be affecting the performance of your fuel system. It can also cause the diaphragms in your Small Engine Fuel Pump to dry out, decreasing elasticity, and thus decreasing pressure in the pump. If your small engine needs a replacement fuel pump for a Walbro, Briggs and Stratton, or Kohler, Jack’s has it and more, including Lawn Mower Fuel Pumps or a Small Engine Electric Fuel Pump! Choose a manufacturer below to get started. Read more about ethanol in the fuel.