Fuel Pump Diaphragm Kit for Marine Outboard and Sport Jet Engines OE: 857005A1 is designed to restore proper function to the fuel pump in a variety of marine engine types.This replacement kit serves as a direct fit for number 857005A1 and is compatible with Force outboard engines, US Marine inboard systems, and Ray inboard engines.It includes all necessary components to replace the diaphragm, enabling effective repair without replacing the entire fuel pump.Constructed to meet the specifications of the part, the kit uses materials resistant to fuel and suitable for marine operating conditions.It supports fuel delivery and is intended for use in applications requiring part numbers such as 14687A4, 21 857005A1, 692 24411 00, 8M0141827, and similar inboard and outboard fuel pump models.Common symptoms indicating the need for diaphragm replacement include fuel leaks near the pump, reduced engine performance, difficulty starting, fuel odors, or engine stalling.Replacing the diaphragm can help resolve these issues and support consistent engine.This kit is applicable to various marine powertrain setups, including Marine outboard and Sport Jet engines, Force outboard engines, US Marine inboard systems, and Ray inboard engines.Its design allows for straightforward installation and provides a functional solution for maintaining fuel system integrity across multiple engine platforms.