If you’re installing a new FASS Diesel Fuel System or upgrading your existing setup, the FASS Single Bolt Sump Kit (SK5501) is one of the simplest and most effective ways to improve fuel delivery.
Designed for quick installation and maximum reliability, this innovative sump eliminates the need to drop the fuel tank—saving time, labor, and frustration.
What the FASS SK5501 Fuel Sump Kit Does
The FASS Single Bolt Sump Kit draws fuel directly from the lowest point of the fuel tank, ensuring a consistent supply of clean diesel to your FASS system—even when fuel levels are low. By reducing the strain on the lift pump and eliminating suction issues caused by factory pickups, the sump helps maintain steady pressure and fuel flow under all conditions.
Key Features and Benefits
- Single-Bolt Design – The SK5501 uses one central bolt and an internal o-ring seal for a fast, secure, leak-free installation. No need for multiple fasteners or complex hardware.
- No Tank Drop Required – Drill one hole in the tank bottom and install from the outside—no need to remove or lower the tank.
- Increased Fuel Flow – Provides a high-volume feed to your FASS lift pump for smoother starts, consistent pressure, and reduced aeration.
- Heavy-Duty Construction – CNC-machined from premium billet aluminum and anodized for corrosion resistance and long life.
- Universal Fit – Works with most aftermarket and OEM fuel tanks and is compatible with all FASS Titanium and Titanium Signature Series Systems.
Why Upgrade to a FASS Sump Kit?
Many diesel owners experience power loss, cavitation, or hard starts when the factory fuel pickup can’t keep up—especially under towing or performance conditions. The SK5501 Sump Kit solves these issues by letting gravity do the work.
It feeds fuel directly from the tank bottom to your FASS system, ensuring steady flow even when the tank is nearly empty.
This upgrade not only protects your injection components from starvation but also simplifies future maintenance by making the fuel supply line easier to access.
Watch the Installation Video
Want to see how simple the installation really is?
Check out our
official YouTube tutorial where Josh Thornton walks through the complete step-by-step installation process.
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Watch the video here:
How to Install the FASS Single Bolt Sump Kit (SK5501)
The video covers everything from tools required and drilling placement to proper sealing techniques—so you can complete the job with confidence and professional results.
Final Thoughts
The
FASS Diesel Fuel Systems SK5501 Single Bolt Sump Kit is one of the most convenient and performance-boosting accessories you can add to your diesel fuel system. Whether you’re running a Cummins, Duramax, or Powerstroke—or even a commercial diesel setup—this sump provides reliable, unrestricted fuel flow and a cleaner, more consistent supply to your engine.
For the best performance and longevity from your FASS system, we highly recommend adding the SK5501 to your installation.
And don’t forget—watch the full installation video on YouTube for detailed guidance before starting your install.
