Description
Overview
The FASS Fuel Systems Signature Series Adjustable Diesel Fuel System (Part No. FASD08165G) is engineered to be one of the most versatile high-performance fuel systems available for the 1998.5-2004 Dodge Cummins 5.9L. Built around the same proven motor used in the FASS Titanium Signature Series, this ADJ Fuel System Series unit delivers a robust 165 gallons per hour (165GPH) of clean diesel and gives you full control over fuel pressure to match the demands of aggressive builds.
Where a fixed-output pump forces you to compromise, this adjustable system lets you dial in fuel pressure from 1-20 PSI to precisely tune fuel delivery for street, race, or competition applications. That adjustability makes it a natural fit for Moderate to Extreme setups in the 600-900 HP range, keeping the fuel curve matched to your power goals.
Key Benefits
A built-in boost compensation port takes the guesswork out of full-throttle fueling. Air pressure drawn from your intake manifold raises fuel pressure under boost, maintaining consistent fuel delivery exactly when your Cummins needs it most. FASS Whisper Technology keeps operation quiet, while the machined 6061 T-6 billet aluminum construction and black finish deliver durability and a clean underbody appearance.
Every system also includes a dedicated fuel pressure gauge port so you can monitor performance directly, plus all the mounting hardware required for installation. It arrives as a complete kit designed to improve fuel flow and support high-horsepower fueling on demand.
Highlights
- High-performance 165GPH flow rate for demanding Cummins builds
- Adjustable fuel pressure from 1-20 PSI to customize fuel delivery
- Boost compensation port raises pressure under full throttle
- FASS Whisper Technology for quieter operation
- Built-in fuel pressure gauge port for real-time monitoring
- Constructed from 6061 T-6 billet aluminum with a black finish
- Sold as a complete kit with all mounting hardware included
Fitment
This adjustable Signature Series system is designed specifically for 1998.5-2004 Dodge Cummins 5.9L Truck/SUV applications. It ships as a fuel system only and must be used with your factory fuel components.
Whether you’re chasing consistent fuel pressure at the track or building a street truck that needs reliable, adjustable fuel delivery, this FASS system pairs race-ready capability with the refinement Cummins owners expect. Choose it to take command of your fuel curve, protect your engine under load, and unlock the fueling headroom that big-power 5.9L applications demand.
