1、Application: Diesel heater fuel metering pump is specially designed for Eberspacher Airtronic D2 D4 12V, suitable for replacing the old or damaged metering pump. 2、Part Number: OE number of fuel metering pump are 22451901, 22451910000, 28451901, 2451910000. Please double check the part number of your item before ordering. 3、Function: The parking heater fuel pump supplies fuel to the machine by pulse, and pumps the fuel into the combustion chamber to keep the machine burning. 4、Advantages: Through high accuracy processing, the fuel pump is characterized low noise, long service life, waterproof, automatic pressure relief, oil saving, etc. 5、Easy to Clean and Observe: The fuel pump has a removable design, with a transparent cover to observe the internal conditions, and dual filtration provides more efficient filtration.