The Edelbrock High Performance Accelerator Pump Plunger and Spring are shorter than standard street plungers which provides additional pump shot volume to the accelerator pump. The right components will help to keep your carburetor working to its full potential. It is one of the top quality replacement assemblies. The accelerator pump plunger and springs are found in cars equipped with carburetors. When you accelerate, the accelerator pump delivers extra fuel through the accelerator pump circuit to allow the engine to deliver more power. The right components will help to keep your carburetor working to its full potential. It is used to provide the fuel necessary for smooth operation.