The Hitachi Direct Injection High Pressure Fuel Pump Kit - 472683 is a comprehensive set of products designed to service a car's fuel system. This kit includes a high pressure fuel pump, which is responsible for delivering fuel to the engine at the correct pressure for efficient combustion. The kit also contains a fuel filter, which helps to remove impurities from the fuel before it reaches the engine. Additionally, the kit includes a fuel pressure regulator, which helps to regulate the amount of fuel being delivered to the engine. Together, these products work to ensure that the car's fuel system is functioning properly and providing the necessary fuel for optimal engine performance.