Description
Overview
The FASS FASD02100G Signature Series Adjustable Diesel Fuel System is engineered to be one of the most versatile high-performance fuel systems available for the 1989-1993 Dodge Cummins 5.9L 12 Valve. Built around the same proven motor found in the FASS Titanium Signature Series, this adjustable lift pump delivers a robust 100 gallons per hour (100GPH) of clean, consistent diesel to your injection system, making it an ideal upgrade for trucks running anywhere from stock to moderate power in the 0-600 HP range.
What sets this system apart is its fully adjustable fuel pressure. Instead of being locked to a single pressure, you can dial in delivery anywhere from 1 to 20 PSI to match the exact demands of your engine, from a daily-driven 12 Valve to a race or competition build. That tunability lets you customize fuel delivery as your setup evolves, keeping the injection pump fed under every condition.
Key Benefits
Diesel performance lives and dies by consistent fuel pressure, and the FASS design addresses this head-on. A built-in boost compensation port uses air pressure from your intake manifold to raise fuel pressure under full throttle, maintaining supply exactly when the engine is working hardest. FASS Whisper Technology keeps the system running quietly, while the high-flow 100GPH capacity improves overall fuel flow to support bigger power goals. A dedicated fuel pressure gauge port makes it easy to monitor your pressure and confirm your adjustments.
- Adjustable fuel pressure from 1-20 PSI for stock-to-moderate 0-600 HP applications
- High-performance 100GPH flow rate to improve fuel delivery
- Boost compensation port raises fuel pressure under full throttle
- Built-in fuel pressure gauge port for easy monitoring
- FASS Whisper Technology for quieter operation
- All mounting hardware included, finished in black
Fitment
This Signature Series Adjustable Fuel System is designed specifically for the 1989-1993 Dodge Cummins 5.9L 12 Valve (Cummins Truck/SUV applications). It is part of the FASS ADJ Fuel System Series and is sold as each (one complete system). Part number FASD02100G.
Please Note
This is a fuel system only and must be used with your factory or compatible fuel components. Because it ships with all mounting hardware included and offers adjustable pressure with boost compensation, it installs as a comprehensive upgrade over a marginal factory lift pump, giving your 12 Valve Cummins the steady, tunable fuel supply that high-performance diesel engines require.
Whether you are chasing reliability on a stock rebuild or feeding a competition-oriented setup, the FASS FASD02100G lets you set fuel pressure to your needs and maintain it under load, backed by the same motor technology used across the FASS Titanium Signature Series lineup.
