AutoParts Store
SITE INFO
1-855-587-3736
Mon - Fri | 10am - 4pm EST
Shopper Approved - 4.8 StarsTrust Guard Secure
SHOP
PRODUCTSBRANDSPARTS REQUESTDEALERS
SUPPORT
CONTACTORDER STATUSFAQSHIPPING POLICYRETURN POLICYPRIVACY POLICY
COMPANY
ABOUT USNEWSGALLERYREADERS RIDESRR TERMS OF USESITE MAP

Copyright © 2026 KT Performance. All Rights Reserved. Powered by  Web Shop Manager.

kt-performance
kt-performance
Additives & Fluids
Air Intake & Cleaning Kits
  • Air Filters
  • Air Intakes
Apparel
Axles & Axle Parts
  • Axle - Rear (Both Sides)
  • Axle - Rear Left
  • Axle - Rear Right
  • Axle Bearings & Seals
  • Axle Kit - Front
  • Axle Kit - Rear
  • Bearing Kits
  • Cases & Spiders
  • Differential Covers
  • Miscellaneous Axle Parts
  • Ring & Pinion Sets
  • Small Parts & Seals
  • Traction Devices
  • Yokes
Dually Wheels|Wheels|Tire & Wheels
Electronic Accessories
Electronic Performance
Electronic Performance/ Tuners
  • Street Application Performance
Engine Parts
  • Coolant System Parts
  • Engine Controllers/Sensors
  • Engine Fasteners
  • Engine Gaskets & Seals
  • Exhaust Manifolds
  • Fuel Injection Parts
  • Intercoolers/Tubing
  • Miscellaneous Maintenance Items
  • Oil System & Filters
  • Pistons and Rings
  • Turbos/Superchargers & Parts
Exhaust
  • 3" Cat Back Exhaust
Exterior Accessories
  • Bed Accessories
  • Brush Guards & Bumpers
  • Fender Trim
  • Nerf Bars & Steps
  • Winches
Fuel Pump Systems
Gauges
  • 2-1/16" Gauges
Holiday Super Savings Sale!
  • FASS Sale Items
  • Industrial Injection Sale Items
  • XDP Sale Items
Lighting
  • Fog, Auxiliary Lighting & LED Lights
  • Headlights/Driving Lamps
  • Lighting Mounts, Covers & Accessories
  • X - Off-Road Lighting
New Edge Items
Steering/Suspension Parts
Stock Room
Test Category
Tools
  • Tool Boxes
Towing & Recovery
Transmission
  • Complete Automatic Transmissions
  • Jeep Transmission & Components
  • Misc. Transmission Parts
  • Torque Converters
  • Transmission Rebuild Kits
UTV Accessories
  • UTV Accessories
  • UTV Axles
  • UTV Bearings
  • UTV Belts
  • UTV Bumpers
  • UTV Doors/Enclosuers
  • UTV Engine Parts/Clutch Kits
  • UTV Frame/ Chassis
  • UTV Lift Kits/ Portals
  • UTV Radios/Audio
  • UTV Radius Arms
  • UTV Rock Sliders/Nerf Bars
  • UTV Steering/Suspension
  • UTV Tire Racks
  • UTV Tires/Wheels
  • UTV Windshield

Brands

Parts Request

Dealers

About

Contact

1-855-587-3736

MY CART

YOUR CART IS EMPTY

Browse parts and accessories to get started.

Brands
Parts Request
Dealers
About
Contact
HOME / PRODUCT / FASS Fuel Systems Drop-In Series Diesel Fuel System for Dodge/Ram (2003-07) 5.9L Cummins
SaleFASS Fuel Systems Drop-In Series Diesel Fuel System for Dodge/Ram (2003-07) 5.9L Cummins

FASS Fuel Systems Drop-In Series Diesel Fuel System for Dodge/Ram (2003-07) 5.9L Cummins

SKU: FKRHDIFSRAM2001
FASS Fuel Systems Drop-In Series Diesel Fuel System for Dodge/Ram 5.9L Cummins Please Note: Installation of this kit on a cab and chassis may require modifications. Drop-In Fuel Systems are a plug-and-play filtration upgrade and are not compatible with our Fuel Sump Kit. No additional items are needed for installation. This plug-and-play filtration system retains the Cummins OEM in-tank fuel pump. The FASS Drop-In Series Diesel Fuel System was engineered by FASS to be the most effective filtration solution for the 5.9L Cummins. Backed by our limited lifetime warranty, the Drop-In Series Fuel System protects your 5.9L Cummins from the issues caused by fuel contamination. Without proper fuel filtration, modern diesel injection systems are prone to excessive wear, which can cost THOUSANDS! By removing over 99% of the water from your diesel fuel, along with entrained air and debris down to 2 Microns, the Drop-In Series System protects the 5.9L Cummins’ injection system from premature failure. Additionally, by eliminating the contaminants mentioned above, our Drop-In Series System for the 5.9L Cummins optimizes MPG (results will vary), restores horsepower, and sharpens throttle response. And if reliability, optimized MPG, restored horsepower, and a sharper throttle response aren’t enough, this system can be installed in an hour or less! This is a true plug-and-play system, requiring no cutting, wiring, or additional modifications. Our industry-leading water removal capabilities (3rd-party proven to exceed 99%) are reinforced by the unique design of our Extreme Water Separator (XWS). If our XWS reaches capacity, it acts as a dam, shutting down your truck and preventing major destruction of fuel system components
$504.99$555.99
Loading options…

Description

•FASS Drop-In Technology was developed to achieve industry-leading filtration with the simplest possible installation—making our Drop-In Series Systems a true bolt-in upgrade. If you’re mechanically inclined, a Drop-In Series Fuel System can be installed in your driveway in less than an hour! But don’t let the easy installation fool you—our Drop-In Series Fuel Systems offer the same world-class filtration as our Titanium Signature Series and Industrial Series lines.

•Performance Radius Cuts (PRC) are an advanced machining technique used to improve the flow of fuel through the FASS System by creating smooth-flowing cuts within the filtration system. This prevents the reintroduction of air and vapor back into the fuel and prevents eddy currents from forming within the corner of a 90-degree sharp angle. FASS Drop-In Fuel Systems are the only Fuel Air Separation System that incorporates these exclusive Performance Radius Cuts, lesser competitors commonly use T-Bone and square 90-degree fittings that can limit fuel flow, cause restrictions and reintroduce air back into your fuel.

Features:
•The only drop-in 5.9L Cummins filtration system that retains the full functionality of the water-in-fuel sensor!
•The only drop-in 5.9L Cummins filtration system with air separation!
•Increases lubricity of the fuel by up to 10% by removing entrained air and air vapor.
•Extends the life of fuel injection system components.
•Over 99% free and emulsified water separation with our Extreme Water Separator technology.
•2 Micron absolute filtration rating.
•100% drop-In, no additional modifications needed.
•Retains the factory in-tank lift pump.
•Internal air separation passages for removing entrained air and air vapor.
•Electric heater options are available for improved cold weather reliability.

Fits: 2003-2007 RAM 2500 & RAM 3500 5.9L Cummins (WITH AN IN-TANK LIFT PUMP). 2003-2004.5 trucks MUST have been retrofitted with an in-tank lift pump in order to utilize this product.

Please Note: THIS IS NOT A LIFT PUMP! This is an air separation/filtration system that utilizes your factory lift pump.

Tell a Friend

Your Name:
Product:FASS Fuel Systems Drop-In Series Diesel Fuel System for Dodge/Ram (2003-07) 5.9L Cummins

200 characters remaining