STA-BIL Fast Fix 8 oz Fuel Treatment for Small Engines, Cleans Carburetors, Improves Engine Performance
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STA-BIL Fast Fix 8 oz Fuel Treatment for Small Engines, Cleans Carburetors, Improves Engine Performance

|36 ratings

Key item features

  • Engine Restoration: Fixes rough-running engines by eliminating gum and varnish buildup, which are common causes of starting issues in small engine equipment.
  • Ethanol Defense: Combats the detrimental effects of ethanol-blended gasoline, protecting engine components from associated damage.
  • Water Removal: Effectively removes water from the fuel system, preventing the need for engine disassembly and protecting against moisture-related problems.
  • Broad Compatibility: Versatile fuel treatment compatible with all 2-cycle and 4-cycle small engines, including those found in lawn mowers, chainsaws, trimmers, snow blowers, and generators.
  • Carburetor Cleaning: Cleans carburetors and injectors, improving overall engine performance and ensuring smoother operation.
  • Usage Instructions: For rough engines, use 1 oz per 2.5 gallons of fuel, then run the engine for 15 minutes; for non-starting engines, allow the additive to circulate and sit overnight.
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Specs

Brand, STA-BILAutomotive additive type, Engine Fuel TreatmentRec. use, AutomotiveVolume capacity, 8 ozContainer type, BottleSize, 8 oz

About this item

Product details

STA-BIL Fast Fix is designed for small engines, enhancing performance by cleaning carburetors and injectors, removing water, and solving rough engine problems. Treats up to 20 gallons of fuel. Ideal for lawn mowers, chainsaws, trimmers, snow blowers, and generators, protecting against ethanol's adverse effects.
  • FIXES ROUGH RUNNING ENGINES – STA-BIL Fast Fix eats away at gum and varnish that cause rough starts and no starts in your small engine equipment. This easy-to-use fuel additive combats the effects of ethanol blended gasoline
  • ELIMINATES WATER – This fuel injector cleaner helps to remove water that may get into your fuel system. Penetrating deep into the fuel line, this simple fuel additive prevents the need to disassemble the engine.
  • VERSATILE – Compatible with all small engines, adding STA-BIL Fast Fix to your 2-cycle or 4-cycle small engine cleans carburetors and injectors while acting as a water remover. Use this product in your lawn mower, chainsaw, trimmer, snow blower, generator, and more
  • DIRECTIONS – For rough running engines use 1 oz. of STA-BIL Fast Fix per 2.5 gallons of fuel. Fill with fresh gas. Start the engine and allow to run for 15 minutes to allow the additive to work its way through the fuel system. If the engine does not start, attempt to turn it over a few times so the additive makes its way through the fuel system and allow to sit overnight. Attempt to start again, if problems persist you may need to have it looked at by a mechanic.
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Specifications

Brand

STA-BIL

Automotive additive type

Engine Fuel Treatment

Rec. use

Automotive

Volume capacity

8 oz

Warranty

Warranty information

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Customer ratings & reviews

4.7 out of 5 stars
stars
36 ratings15 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars89% (32)
  2. 4 stars0% (0)
  3. 3 stars6% (2)
  4. 2 stars0% (0)
  5. 1 star6% (2)
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Showing 1-3 of 15 reviews

Oct 22, 2026
Reviewer name: AJ
Top Reviewer
Item details
Size: 8 oz
Sold and shipped byHappEshopper
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Seems to clean out the carburetor s

Bought this for my generators and it seems to help with cleaning the carburetor running smoothly now. Bought more to keep on hand cause it's always sold out

Helpful?6GEZ02ZFRPXG608893977
Oct 17, 2026
Reviewer name: Troy
Item details
Size: 8 oz
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

worked well

Helpful?6GEZ02ZFRPXG608893977
Sep 6, 2026
Reviewer name: Jean
Item details
Size: 8 oz
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Must for optimizing your small engine's performanc

Now that all gas blends are required to contain ethanol, using FastFix is a must if you want your mower, rototiller or weed eater to work well throughout the mowing season. Ethanol attracts water; FastFix helps keep the engine dry. It also helps keep gummy deposits out of the carburetor. Adding FastFix to your container of gasoline will keep your small engines humming.

Helpful?6GEZ02ZFRPXG608893977
Current price is $13.31
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Sold and shipped by HappEshopper
4.35304054054054 out of 5 stars
4.4 stars out of 5, based on 592 seller reviews(4.4)
Extended holiday returns
Free Holiday returns until Jan 31