The Bosch Leak Detection Pump (part number 0261222019) is a component used in automotive fuel systems to detect and prevent leaks. It is responsible for monitoring the fuel tank and associated lines for any leaks or cracks, and then triggering a warning light on the dashboard if a leak is detected. This pump is essential for maintaining the safety and efficiency of the vehicle's fuel system. It is a high-quality, reliable product from the trusted brand Bosch.