E422KPD98 Fuel filter

The E422KPD98 is one of the most widely stocked Hengst fuel filters in MAN workshop parts lists, serving as the aftermarket equivalent of MAN OEM 51125030109 across TGA, TGS, TGX, and TGM platforms with the standard in-line primary filter housing. Its job is straightforward but critical: strain particulate contamination and separate free water from diesel before it enters the high-pressure injection pump and injectors. Modern common rail injectors operate with internal clearances measured in microns — abrasive particles and water cause accelerated wear of needle valve seats and solenoid components that leads to costly injector replacement. Hengst manufactures the filter media in Germany to OEM-equivalent efficiency and pressure-drop specifications. Replace at the manufacturer's stated service interval without extension. When fitting, prime the filter housing with clean diesel and allow the paper element to soak for several minutes before cranking the engine — this reduces the dry-running period of the injection pump lift circuit and prolongs pump life. Dispose of the spent filter as hazardous waste.