{"product_id":"fass-difsl5p2001-fass-drop-in-series-fuel-system-for-2020-to-2025-gmc-chevrolet-duramax-6-6l-difsl5p2001","title":"FASS Drop-In Series Fuel System for 2020 to 2025 GMC\/Chevrolet, Duramax 6.6L (DIFSL5P2001)","description":"\u003cp\u003eFASS Drop-In Series Fuel System for 2020 to 2025 GMC\/Chevrolet, Duramax 6.6L (DIFSL5P2001)\u003c\/p\u003e\n\n\u003cp\u003eGMC\/CHEVY Drop-In Product Manual Downloads\u003c\/p\u003e\n\n\u003cp\u003eTHIS IS NOT A LIFT PUMP! This is an air separation\/filtration system that utilizes your factory lift pump.\u003c\/p\u003e\n\n\u003cp\u003eThe DIFSL5P2001 Fits: 2020-2025 Crew Cab Short Bed L5P Duramax\u003c\/p\u003e\n\n\u003cp\u003eNote: Installation on cab and chassis may require modifications. Drop In Fuel Systems are plug and play filtration upgrades and not compatible with Fuel Sump Kits. System retains the OEM fuel pump.\u003c\/p\u003e\n\n\u003cp\u003eThe FASS Drop In Series Diesel Fuel System is engineered to be the most effective filtration solution for the 6.6L Duramax. Backed by a limited lifetime warranty, it protects against issues caused by fuel contamination.\u003c\/p\u003e\n\n\u003cp\u003eIf you drive a GMC\/Chevrolet with a Duramax diesel engine and want better fuel filtration, improved reliability, and injector protection without an external frame mounted pump, this is the perfect solution.\u003c\/p\u003e\n\n\u003cp\u003eThe FASS Drop-In Series System for the L5P Duramax replaces the plastic OEM single filter housing with a 6061-T6 billet aluminum American made dual filter housing. This system utilizes the OEM water separator element in conjunction with our 2 micron Extreme Water Separator. Utilizing the OEM water separator element allows the water-in-fuel sensor to operate correctly, notifying you before the water reaches the clean side of the fuel filter element. Many other systems on the market utilize a spin-on water separator that places the WIF sensor on the clean side of the filter meaning by the time your WIF light is triggered, it’s too late! Our Extreme Water Separator provides the final particulate and water filtration filtering particulates down 2 microns and removes over 99% free and emulsified water. OEM filtration provides a 5 micron filtration rating allowing the larger particulates to pass through to your injection system.\u003c\/p\u003e\n\n\u003cp\u003eReliability, Simplicity, Protection\u003cbr\u003e\nSupports Stock \u0026amp; Modified Duramax: Plenty of fuel for stock and modified GMCs and Chevrolets.\u003cbr\u003e\nInjector Protection: Will triple the life of your injectors and injection pump.\u003cbr\u003e\nFASS Filtration: Optimizes combustion, restores horsepower, maximizes MPG (results vary).\u003cbr\u003e\nLimited Lifetime Warranty: Register your FASS system for coverage.\u003cbr\u003e\nAdvanced Filtration Technology\u003cbr\u003e\nWater Separation: 3rd‑party proven to eliminate over 99% of water.\u003cbr\u003e\nAir\/Vapor Removal: Eliminates entrained air and vapor that damage injection systems.\u003cbr\u003e\n2 Micron Absolute Microglass Filtration: Removes smaller debris than OEM filters.\u003cbr\u003e\nKey Benefits\u003cbr\u003e\nImproves Reliability: Triples the injection system life.\u003cbr\u003e\nMaximized Horsepower: Improved fuel atomization and restored timing.\u003cbr\u003e\nOptimized MPG: More efficient combustion (results vary).\u003cbr\u003e\nPeace of Mind: Extreme Water Separator acts as a fail‑safe.\u003cbr\u003e\nCold Weather Confidence: Dependable starts in extreme cold.\u003cbr\u003e\nCleaner Operation: Reduces DPF regens and soot.\u003cbr\u003e\nImproves Fuel Lubricity: At least 10% improvement.\u003cbr\u003e\nKey Features\u003cbr\u003e\nOnly drop in 6.6L Duramax filtration system that retains OEM water in fuel light.\u003cbr\u003e\nOnly drop in 6.6L Duramax filtration system with air separation.\u003cbr\u003e\n100% drop in installation; no modifications needed.\u003cbr\u003e\nRetains factory lift pump.\u003cbr\u003e\nPerformance Radius Cuts (PRC):  Smoother internal fuel flow.\u003cbr\u003e\n2 micron absolute filtration rating:  Captures finer debris than OEM.\u003cbr\u003e\nRemoves over 99% of water:  3rd party verified.\u003cbr\u003e\nPatented air\/vapor removal process.\u003cbr\u003e\nHeater options available for cold weather.\u003cbr\u003e\nLimited Lifetime Warranty (with registration).\u003cbr\u003e\nWhat’s Included In The DIFSL5P FASS Drop-In Series:\u003cbr\u003e\n(1) FASS Drop-In Series Air Separation\/Filtration System\u003cbr\u003e\n(1) FASS XWS3002 Extreme Water Separator\u003cbr\u003e\n(1) Installation Kit Including Fittings, Bracketry, and Hardware\u003cbr\u003e\nWhy Choose FASS?\u003cbr\u003e\nFASS designs fuel systems with longevity and real‑world performance in mind. The Drop‑In Series offers proven filtration and injector protection without altering the OEM configuration, ideal for daily drivers and work trucks.\u003c\/p\u003e","brand":"FASS","offers":[{"title":"Default Title","offer_id":47238219956396,"sku":"DIFSL5P2001","price":479.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0768\/2736\/1452\/files\/cf92fb43-efbf-462c-94d3-40c44a657621.png?v=1789675736","url":"https:\/\/thetuneshop.com\/products\/fass-difsl5p2001-fass-drop-in-series-fuel-system-for-2020-to-2025-gmc-chevrolet-duramax-6-6l-difsl5p2001","provider":"The Tune Shop","version":"1.0","type":"link"}