Description
Overview
The FASS Diesel Fuel 5/8 Suction Tube Upgrade Kit (Part No. STK1003B) is a precision-engineered fuel tube designed to increase the volume of fuel your system can draw from the factory fuel basket. Machined from durable 6061 T-6 Billet Aluminum and sold as a complete kit, this convoluted suction tube upgrades your existing Bulkhead Fitting (STK1002) so your pump can pull more diesel, more consistently. If you’re chasing reliable fuel delivery and cleaner performance from your fuel line and fuel hose setup, this is a foundational upgrade for higher-volume systems.
Key Benefits
Factory suction tubes often struggle once the tank drops toward the quarter mark, starving the pump and disrupting flow. The FASS 5/8 inch convoluted suction tube uses a larger 5/8 inch suction tube port and a unique design that pulls fuel directly from the factory fuel basket. The result is improved fuel volume and the elimination of the common quarter-tank fuel issue that plagues many diesel trucks. For anyone comparing fuel line sizes, fuel hose diameters, and high pressure fuel line supply components, stepping up to a larger suction tube is one of the most effective ways to keep a hungry fuel system properly fed.
Highlights
- Upgrades existing Bulkhead Kits (designed to work with STK1002)
- 5/8 inch convoluted suction tube port for increased fuel delivery
- Pulls fuel directly from the factory fuel basket
- Eliminates the common quarter-tank fuel issue
- CNC-quality 6061 T-6 Billet Aluminum construction
- Sold as a complete upgrade kit
Best Paired With
This suction tube is suggested to be installed with FASS Titanium Series Systems that already include a Bulkhead Fitting Suction Tube Kit. The larger suction tubes and Fuel Sump Bowl improve fuel delivery and work perfectly with higher-volume fuel systems, making this upgrade an ideal complement when you’re building out a serious diesel fuel supply. Whether you’re refreshing rubber fuel line, running braided fuel line, or upgrading to stainless steel fuel line elsewhere in your system, correcting the suction side ensures the rest of your fuel lines deliver to their full potential.
Fitment
Engineered for Truck/SUV applications, the STK1003B is suitable for universal applications including Ford Powerstroke, GM Duramax, and Dodge Cummins platforms. Please note: the STK1003/1003B kit will not work on 03-04 Dodge applications. Confirm your setup uses the existing Bulkhead Fitting (STK1002) that this 5/8 inch suction tube is intended to upgrade before installing.
