FASS Drop-In Series Diesel Fuel System

The Drop-In Series is the quickest way onto FASS filtration. FASS says it mounts in the factory location and uses your OEM fuel lines: no cutting, no drilling, and typically one to three hours in the driveway. It's a good fit if you want better fuel filtration and water separation without a full frame-mounted lift pump install.

Fitments differ by cab and bed on the L5P Duramax, so read the option carefully. The 17-19 Crew Cab Short Bed / 17-23 Crew Cab Long Bed kit is a different part from the 20-23 Crew Cab Short Bed kit. There are also heavy-duty options for the Caterpillar 3406E/C-series (with 1R-0749/1R-0750 filters) and a universal heavy-duty kit.

Why we like it

• Mounts in the factory location on OEM fuel lines (per FASS)
• No cutting or drilling, and a short install (per FASS)
• Replacement CWS1010 filter is listed for the DIFSRAM1001 and DIFSFRD1001 kits (per Turn14)
• Truck-specific and heavy-duty fitments

Fitment: Ram 2500/3500 Cummins 2003-2023, L5P Duramax 2017-2023 (by cab/bed), Ford 6.7L Power Stroke 2017-2023, Caterpillar 3406E/C-series, universal heavy duty. Choose your exact application from the options; each option is a specific FASS part number.

Questions on fitment? Call the shop at (806) 503-2161.

Ships direct from a US warehouse in 1-3 business days. Most parts drop-ship directly from the manufacturer or distributor warehouse; tracking is emailed as soon as it ships.

Free shipping on qualifying orders. Free local pickup in Ropesville, TX.

Questions? Call (806) 503-2161 (Mon-Fri 8am-5pm CT) or email blackdiamondultd@gmail.com.