Your main concern: “The X-1 is too big to fit on my rig.”
So we redesigned how it’s integrated into the fuel system!


  • Much smaller footprint
  • Fits on most diesel vehicles
  • Costs less
  • Simpler design; fewer parts
  • Even more robust & problem free
  • New depot applications
  • All the same great benefits


  • More Class-8 Semis
  • Smaller Trucks
  • Buses and RVs
  • Utility Vehicles
  • Larger Pickups
  • Tractors and Agri-Equipment
  • Marine Applications

Features of the K9000 Onboard Optimizing Mini-Refinery

Performance Enhancements

  • Ultra-refines diesel and biodiesel blends
  • Increases horsepower and torque
  • Improves progressive shifting at lower RPMs, with less downshifting on all grades
  • Engine runs quieter, smoother, and stronger
  • Lowers engine operating temperatures, with less fan clutch engagement
  • Emulsifies chemical additives, paraffin, and entrained and free water, providing a superior fuel that burns more evenly and completely
  • Reduces strain on HPCR systems—reducing injector clogging with a cleaner fuel
  • Cleans engine while driving
  • No modification to diesel engine required—easily connects to fuel tanks and 12VDC
  • Installs quickly with basic mechanical skills
  • Risk-free 2-year warranty and 60-day, money-back guarantee

Economic Benefits

  • Over 750,000 miles of real world testing confirms up to 20% savings
  • Pays for itself in 8-12 months
  • Financing options available for immediate positive cash flow
  • Increases your fleet's competitiveness
  • Easily transfers to your next vehicle for continued payback
  • Engineered for the long haul: built to DOT and Class 8 OEM standards
  • Virtually maintenance free; minimal staff retraining
  • With optional mounting brackets weighs less than 100 lbs.

Environmental Advantages

  • Meet corporate sustainability goals and objectives with reduced emissions
  • Enhanced combustion reduces soot and particulates, resulting in fewer regen cycles
  • Dyno test certified up to 14.23% reduction in NOx emissions

Onboard Installations

Flatbed Tow Truck


Simple installation on a smaller truck.

Feedback: The owner reports "noticeably better mileage" on frequent longer trips of about 250 miles to nearby cities. As a tow truck with considerable idling and varied trips, overall data is hard to measure. But engine performance is excellent.

Class 8 Tractor


The K9000 fits easily between the frame rails. This installation uses a frame and j-bolts. The K9000 can also be directly bolted to the frame rail.

See Written Testimonial letter.

See Video Testimony on our Home page.

Irrigation Pump


Large irrigation pumps powered by diesel engines are ideal for the K9000, as they often operate nearly 24/7 and consume large quantities of diesel.

Keep this important equipment running in peak condition with optimized fuel, extending its life, lowering maintenance costs, and burning less fuel with lower emissions.

Feedback: This owner reports fuel consumption reduced from 3.56 to 3.31 gal/hr (over 7% savings) during the last tenth of his season, and has ordered 2 more systems for this upcoming growing season. We believe his savings will continue to improve, as initial consumption is higher until our optimized fuel has fully cleaned the engine.

Marine Applications


Marine environments are tough on fuel, which rapidly degrades while sitting in your tanks. Moisture easily enters from condensation and diesel's own hydrophilic nature. Warm, tropical air enhances algae growth and dramatically increases water absorption. The KM9000 breaks down contaminants and entrained water clusters, creating an optimized, homogenous fuel.

The KM9000 has a more rugged enclosure and is constructed of hardened components to withstand a harsh saltwater environment. It can be plumbed directly to your onboard fuel tanks so your engines always have optimized fuel, or it can be mounted on a cart for periodic in-port use, servicing one or more vessels.

Keep your diesel watercraft clean-burning, with optimal power, enhanced fuel efficiency, and reduced maintenance. See testimony of the dramatic difference the KM9000 can make.

Depot Installations

Deliver Optimized Fuel To Your Entire Fleet

FFS depot systems are perfect for any business with its own diesel fuel tanks servicing multiple vehicles that normally return each day for fueling and to park overnight. Such businesses include local shipping fleets, construction companies, school districts, utilities, and farms.

The K9000 processes your tank after fuel delivery, and periodically to maintain its optimal state. Our systems are modular and scalable, stationary or mobile, and can process one or more tanks, typically from 500 to 10,000 gallons.

School District Buses


This small elementary school in southern Arizona has two primary buses and three occasional use buses. Our installation services two 1,000 gallon tanks. The FFS tank with fully processed, optimized fuel is on the left in the photo. The two main tanks are also processed over time.

Data from the second year of service (Fall 2022) shows an average 14.9% and 15.9% increase in mpg for the two primary buses over data from the first year of service, to 10 and 9.5 mpg respectively.

See official Letter of Recommendation.

FLASH UPDATE: Data from Spring 2023 (Feb thru July) shows further improvement: an average 25.3% and 17.1% increase in mpg for the two primary buses over data from the first year of service, to 10.9 and 9.6 mpg respectively.

Agricultural Installation


This farm installation features a mobile 837 gallon tank that can transport optimized fuel to equipment in the field.

See above for other K9000 farm applications, such as utility vehicles and irrigation pumps.

Economic Benefits

Fuel savings of up to 20%

Proper use of the K9000 onboard fuel optimizer will achieve consistent savings of up to 20%! No other single product provides such an impressive mileage improvement along with significantly enhanced performance, reduced emissions, and the convenience of diesel fuel.

No other fuel efficiency system delivers a lifetime of savings with this much performance and peace of mind


There are many aftermarket retrofit designs currently being sold as fuel saving devices. Some have negligible or possibly harmful effects on fuel efficiency.

Other fuel savings technologies, such as power for idle reduction, improved aerodynamics, automatic tire inflation, single wide-base tires, and lighter-weight components produce minor incremental improvements that can take years to pay for themselves.

K9000 savings are the direct result of consistently delivering better fuel to your engine, resulting in more even and complete combustion. As a result, less fuel in consumed to do the same task. It’s just that simple!


  • Older trucks remain competitive longer
  • Less risk of HPCR pump failure
  • Climb grades faster when needed/desired
  • Better driving experience–less driver turnover
  • Oil and oil and fuel filters remain serviceable longer
  • Reduced injector clogging
  • Less downtime from faulty EGR or DPF cleaning
  • Cleaner oil–less wear & tear–longer engine life
  • Fewer regen cycles and less DEF fluid consumed
  • Eliminate algaecide and additive use

FFS's fuel efficiency solutions deliver impressive savings from the day of installation

Unrivaled ROI

The K9000 fuel optimizer offers unparalleled return on investment (ROI). While there is often uncertainty about ROI when adopting new trucking technology, the K9000 has been designed and priced to achieve positive cash flow from the first month of system ownership.

Based on national averages, the individual long-haul trucker can achieve full system payback in 8 to 12 months, depending on fuel prices, driver habits, and miles driven. After that, 100% of the savings goes directly to you every month!

Or, finance your vehicles and see hundreds of dollars of net savings each from the day of installation.

Enter your driving data to see your truck or fleet's fuel savings.


Don't let financing be an obstacle when exploring your fleet's conversion. FFS has a number of national and regional lease and financing options available to support your cash flow and take-home pay objectives.

Up to 20% fuel savings offers independent owner-operators and fleets peace of mind and the profitable lifestyle you work hard for.

Fierce Fuel Systems is dedicated to putting your hard earned $ in your bank, not in your tank.

© 2021 Fierce Fuel Systems