The Hitachi High Pressure Fuel Pump Kit - 135929 is a comprehensive set of products designed for use in a car's fuel system. It includes various components that work together to ensure the efficient delivery of fuel to the engine. The kit contains a high pressure fuel pump, which is responsible for pressurizing the fuel and delivering it to the engine at the correct pressure for optimal performance. It also includes a fuel filter, which helps to remove any impurities or contaminants from the fuel before it reaches the engine. Additionally, the kit contains various gaskets, seals, and O-rings to ensure a tight and secure fit for all the components. This kit is designed to provide all the necessary parts for a complete fuel system overhaul, ensuring smooth and reliable operation of the car's engine.