Gasoline and diesel fuel degrade during transportation and storage. The Fitch Fuel Catalyst restores fuel to its optimal state for more efficient combustion, which results in increased fuel mileage, more power, and reduced emissions. Cleaner burning Fitch Catalyst treated fuel also keeps engine oil cleaner for extended change intervals, and reduces fuel system maintenance.

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    • (0 reviews)
      # sp823
      Drop-In Tank Fuel Catalyst by Fitch® Fuel Catalyst. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike expensive fuel additives that must be continually replenished, you purchase this product once,...
      $141.85 - $271.65
    • (5 reviews)
      # sp822
      OEM In-Line Fuel Catalyst by Fitch® Fuel Catalyst. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike expensive additives that must be continually replenished, you purchase this product once, for...
      $141.85 - $523.55
    • (0 reviews)
      # sp820
      In-Line Fuel Catalyst by Fitch® Fuel Catalyst. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike fuel additives that must be continually replenished, you purchase this product once, for 250,000...
      $141.85 - $482.85
    • (0 reviews)
      # mpn1953542
      Universal Drop-In Tank Fuel Catalyst by Fitch® Fuel Catalyst. Get improved performance, easier starting, reduced emissions, and long term fuel stability with the F5T Fitch Fuel Catalyst. Unlike expensive fuel additives, which must...
      $51.25
    • (0 reviews)
      # mpn1953524
      In-Line Fuel Catalyst (F36G24) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike fuel...
      $215.55
    • (2 reviews)
      # mpn1953520
      OEM In-Line Fuel Catalyst (F3624) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $215.55
    • (3 reviews)
      # mpn1953525
      OEM In-Line Fuel Catalyst (F3824) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $215.55
    • (0 reviews)
      # mpn1953561
      Drop-In Tank Fuel Catalyst (FFB08) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $141.85
    • (0 reviews)
      # mpn1953518
      OEM In-Line Fuel Catalyst (F3424) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $215.55
    • (0 reviews)
      # mpn1953527
      In-Line Fuel Catalyst (F38G24) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike fuel...
      $215.55
    • (0 reviews)
      # mpn1953521
      OEM In-Line Fuel Catalyst (F3624-T) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $215.55
    • (0 reviews)
      # mpn1953534
      OEM In-Line Fuel Catalyst (F4824B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $271.65
    • (0 reviews)
      # mpn1953523
      OEM In-Line Fuel Catalyst (F3636) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $215.55
    • (0 reviews)
      # mpn1953531
      OEM In-Line Fuel Catalyst (F4624B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $271.65
    • (0 reviews)
      # mpn1953528
      OEM In-Line Fuel Catalyst (F4424B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $271.65
    • (0 reviews)
      # mpn1953535
      OEM In-Line Fuel Catalyst (F4836B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $271.65
    • (0 reviews)
      # mpn1953526
      OEM In-Line Fuel Catalyst (F3836) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $215.55
    • (0 reviews)
      # mpn1953530
      OEM In-Line Fuel Catalyst (F4624-TB) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst!...
      $271.65
    • (0 reviews)
      # mpn1953540
      OEM In-Line Fuel Catalyst (F5836B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, OEM Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike...
      $316.75
    • (0 reviews)
      # mpn1953533
      In-Line Fuel Catalyst (F46G24B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike fuel...
      $271.65
    • (0 reviews)
      # mpn1953536
      In-Line Fuel Catalyst (F48G24B) by Fitch® Fuel Catalyst. Includes In Line Unit, Hose Set, Quick Disconnect Fittings, Adapters and Hardware. Get improved performance and reduced emissions with the Fitch Fuel Catalyst! Unlike fuel...
      $271.65




    The Fitch Fuel Catalyst is the product of Advanced Power Systems International (APSI), Inc. of Torrington, CT. The company was founded in 1994 by a famous race car driver and inventor John C. Fitch, with the objective of creating a product that would both positively affect the environment and provide an economic benefit to the consumer. Originally conceived to provide gasoline stabilization, the production version of the Fitch Catalyst offered much more.

    Fitch® Fuel Catalyst F.A.Q. Fitch® Fuel Catalyst Warranty Fitch® Fuel Catalyst About

    Many fuel treatments on the market promise better fuel mileage, but they must be added to every tank full of fuel, where they are consumed along with the fuel. Whatever mileage increases you may realize are more than offset by the cost of the additive, which must be continually replenished. Not so with the Fitch Catalyst. The Fitch is a true catalyst, which is a substance that induces a chemical reaction without itself undergoing any permanent change. With the Fitch Catalyst, you pay once and enjoy savings thereafter.

    The Fitch Fuel Catalyst has been reviewed and tested by national automotive and recreational vehicle publications like Four Wheeler, Sport Truck, Muscle Car Review, Diesel Power, Diesel Tech, and others. Results varied, but generally all reported gains in fuel mileage, as well as improved throttle response, increased power, reduced emissions, and resistance to engine knock. The consensus opinion: unlike some devices that promise the world and deliver significantly less, the Fitch Fuel Catalyst works as claimed.

    Fitch Fuel Catalyst Reviews

    Average rating:  5  5 - 6 reviews
    Read All Fitch Fuel Catalyst Reviews
    5 of 5
    It Works!
    I was initially skeptical of the claims, but I bought one with hope. Was extremely easy to install (about 20 min). I drive a full size Chevy truck. If I keep my foot out of the throttle, on the highway, I see about a 3-mpg increase (not much in the city). When I put my foot in the throttle, there is a noticeable increase in power. Also, my idle has never been so smooth.
    JPosted by Joshua (Alsip, IL) /
    2008 Chevy Avalanche
    Was this review helpful for you? Yes3  people found this review helpful.
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