51125030109 Filter Element

Primary fuel filter element for MAN TGA, TGS, TGX, and TGM trucks and buses. This cylindrical paper element mounts inside the filter canister housing and removes particulate matter, rust particles, and free water from diesel fuel before it enters the lift pump and high-pressure injection circuit. Water contamination is particularly damaging in modern common rail systems because even trace quantities accelerate corrosion of the precision-machined internal surfaces of the high-pressure pump and injector solenoid valves — repairs at this level typically cost several times the annual fuel filter budget. This MAN part number cross-references to aftermarket equivalents including Hengst E422KPD98 and Kolbenschmidt 50014085, which fit the same housing. Replace at every scheduled major service — do not extend beyond the stated interval even when the element appears clean, as water saturation and microbial contamination are not visible through the housing. When changing the element, inspect the canister O-ring and base drain plug seal and renew both if any compression set or surface cracking is present.