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Upgrade your stock fuel filter with the Wehrli Custom Fab WCF100361 Duramax Fuel Filter Housing (Long Bed) from Mullet Diesel Performance. Featuring an anodized billet aluminum fuel filter base, this upgrade kit installs in the same location as the stock cartridge filter base using the same OEM style quick disconnect fuel line fittings. This kit includes a Donaldson 4 micron fuel filter and water separator, filter base with integral mounting, distribution filter block/filter coupler, quick disconnect fittings, and 1/8" NPT port for fuel pressure monitoring. Increase fuel filter capacity and amount of time between filter changes by upgrading from a stock cartridge style filter to a spin-on canister style filter.