FASS No-Drop Series Diesel Fuel System - Chevy/GMC 2500/3500 Duramax

The No-Drop Series is the Titanium Signature Series supplied with the FASS Fuel Sump. The sump lets the system draw from the bottom of the tank without pulling the factory sending unit, so the tank never comes out of the truck.

Vehicle Fitment

No Tank Drop Required

This kit ships with the FASS Fuel Sump. Instead of pulling the bed or dropping the tank to get at the factory sending unit, the sump installs into the bottom of the tank and feeds the system directly. It is the difference between an afternoon and a weekend, and it is why most shops quote the No-Drop kits at a lower labour rate.

No-Drop Kits: Easier + More Affordable

Flow Ratings, Part Numbers & Install Manuals

FASS rates flow on diesel at operational pressure, not on thin fluid at zero psi. The number below is what the system actually delivers.

Manuals are hosted PDFs and run 5–6 MB. Download over wi-fi before you head out to the truck.

What It Does For Your Truck

• Triples injection system life. Clean, air-free, water-free fuel is the single cheapest thing you can do for a set of injectors and a pump.
• Restores power and throttle response. Better atomisation and stable supply pressure let the injection system do what it was designed to do.
• Improves fuel economy. More complete combustion, though results vary by truck and right foot.
• Starts in the cold. Dependable operation in hard winter climates, especially paired with a FASS heater.
• Runs cleaner. Better combustion means less soot and fewer DPF regens.
• Improves fuel lubricity by at least 10%.

Thinking about a Fuel Sump Kit? Watch this first!

Advanced Filtration Technology

FASS doesn't just move fuel — it conditions it before your injection system ever sees it.

• 2 micron absolute filtration. Microglass media catches debris far smaller than an OEM filter will stop.
• Extreme Water Separator. Third-party verified to remove over 99% of water, and a genuine fail-safe if you ever pull a bad tank of fuel.
• Air and vapour removal. FASS's patented separation process strips the entrained air that causes hard starts, pressure drop, cavitation and injector wear.
• Mass Flow Return (MFR). Unused fuel is sent back through the filters instead of straight to the tank, so the diesel in your tank gets cleaner the longer you drive.

All-New Fuel Sump Kit | EASY Installation!

Key Features

• Whisper Technology — the quietest motor in the category
• Performance Radius Cuts for smoother internal flow with no sharp restrictions
• Heavy-duty bolt-on steel mounting brackets
• 1,000,000+ mile motor life expectancy
• 30,000 mile filter life expectancy
• Optional electric fuel heater ports for cold-climate operation
• Under a 0.5% failure rate across the product line
• Limited lifetime warranty with registration
• Engineered, manufactured and assembled in the USA

FASS Sump Kit (SK5501) Installation Guide | No Tank Drop!

Why FASS

FASS doesn't rush product to market. The company line is “strive for perfection, settle for excellence,” and the sub-0.5% failure rate is what that discipline buys you. Every system is engineered, built and assembled in the United States.

Register your system with FASS to activate the limited lifetime warranty.