PU9991X Fuel Filter Paper Core The PU9991X filter paper core (also marked PU999/1X) is a premium aftermarket fuel filter inner element cross-referenced with Mercedes-Benz OEM number A5410900151, perfectly matched for Mercedes-Benz European heavy-duty commercial trucks and Setra luxury passenger buses, fully compliant with European Euro 5 & Euro 6 emission standards. Manufactured strictly under IATF 16949 international automotive quality system, this pleated composite filter paper core adopts multi-layer gradient density fiber structure, which efficiently intercepts rust particles, sediment, colloidal contaminants, tiny solid impurities and free water mixed in diesel fuel before fuel enters the common rail injection system. It delivers comprehensive protection for high-pressure fuel pumps, precision fuel injectors and internal engine moving components, effectively reducing abrasive wear and water cavitation damage. Rigorously tested to endure long-duration high-load operation, severe road vibration, high-temperature engine compartments and frigid low-temperature alpine environments, this filter core maintains consistent stable filtration efficiency throughout its full service cycle. With precise OEM dimensional molding, it achieves direct plug-and-play installation on matched filter housings without cutting or modification, serving as a must-have routine maintenance consumable for European logistics fleets, long-distance freight companies, passenger bus operators and construction machinery teams worldwide.
Product Material Description:
Main Filter Medium: High-grade imported composite wood pulp paper compounded with fine glass fiber, with uniform stable pore structure, excellent dirt holding capacity and stable permeability for long-cycle heavy-duty filtration work.
End Cap Structure: Reinforced rigid polyurethane plastic upper & lower end caps, high structural rigidity, resistant to deformation under frequent fuel pressure fluctuations.
Sealing Components: Premium FKM fluorine rubber sealing gaskets, featuring outstanding oil resistance, wide temperature tolerance range (-45℃ ~ 135℃) and long anti-aging service life to realize complete leakproof sealing.
Bonding Adhesive: Environmentally friendly high-temperature oil-proof hot melt adhesive, firmly laminates multi-layer filter paper tightly, never dissolves or peels off after long-time immersion in diesel and biodiesel blended fuel.
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