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Start Your Engines! 21205 Fuel System Revitalizer, 4 Fl. oz.

4.2 out of 5 stars 104 customer reviews
| 5 answered questions

Price: $9.11 & FREE Shipping on orders over $35. Details
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4 Fl. oz.
  • Enter your model number above to make sure this fits.
  • Additive ensures quick easy starts after extended storage, and ensures smooth idling and performance in season
  • For all 2 and 4-cycle small engines
  • Easy to use, just add to the equipment's fuel tank
  • Revitalizes fuel and the entire fuel system
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Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states.


Frequently Bought Together

  • Start Your Engines! 21205 Fuel System Revitalizer, 4 Fl. oz.
  • +
  • STA-BIL 22214 Fuel Stabilizer - 32 Fl oz.
Total price: $23.10
Buy the selected items together

Product Information

Size:4 Fl. oz.

Technical Details

Brand Start Your Engines!
Item Weight 4.8 ounces
Product Dimensions 2 x 5 x 8 inches
Origin USA
Item model number 21205
Manufacturer Part Number 21205

Additional Information

ASIN B001B0TCN4
Customer Reviews
4.2 out of 5 stars 104 customer reviews

4.2 out of 5 stars
Best Sellers Rank #5,991 in Automotive (See top 100)
#2 in Automotive > Oils & Fluids > Flushes > Fuel Injection
Shipping Weight 4.8 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available October 17, 2003

Warranty & Support

Warranty, Parts:Parts

Product Description

Size: 4 Fl. oz.

4 OZ, Start Your Engines, Advanced Chemistry Provides Quick Easy Starts & Smooth Running After Storage & In Season, Safe For Use In Any 2 & 4 Cycle Small Engine, Easy To Use, Just Pour In The Engines Fuel Tank, Super Concentrated, 1 Bottle Treats Up To 1 Gallon Of Fuel, Cures Rough Idle & Warm Engine Stalling, Restores Combustible Components Of Stale Gas, Cleans & Removes Varnish From Carburetor Surfaces, Easy Starting & Smooth Idle For Lawn Mowers, String Trimmers, Power Blowers, Snow Throwers, Outboard Motors, Motorcycles, Snowmobiles & Any Small Engine.

From the Manufacturer

Customer Reviews

Top Customer Reviews

Size: 4 Fl. oz. Verified Purchase
Product worked well, got a wood chipper that has not started without starting fluid for 3 years to start on the first pull, something it newer did since I've owned it.

Also a weed wacker that had been in storage for 2 years.

However on a snow blower that was in storage for 10 years, it worked too good. Something that was likely held together by gunk, began to leak.

So for something that's been in storage for a real long time. Check first for hoses etc. that have physically deteriorated before using.
4 Comments 42 of 44 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 4 Fl. oz.
I have a Craftsman Lawnmower with a 5.5HP Honda engine I bought in 2000. Living in FL and TX, this sucker has been used hard. Over the last 2 years this mower has been harder and harder to start. I changed the spark plug, the air filter and even took the carb out, blew it out with compressed air and soaked it in carb cleaner for 3 days. After all that, still 15-20 pulls to start. Over the past 3 months I resorted to spraying engine starter in the carb to get the darn thing going.

I thought long and hard about a new mower, I mean heck this thing is 10 yrs old. Well, I saw the commercial for this on TV, so I thought, one last ditch effort to keep some hard earned money in my pocket and not buy a new mower.

Well, I poured in 1/2 a bottle and added new gas. It started on the 3rd pull. I was AMAZED, but also thought, sure it will start now, but what about in a week?---Well today was one week later. I went out and pulled, and it started in the first pull...UNREAL!!!!

I'm not sure how long this will last, but right now I am very happy. Buying 2 bottles of this per season, is alot cheaper than buying a new mower. :-)
Comment 25 of 26 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 4 Fl. oz. Verified Purchase
I had 2 gas mowers that had set with gas in them all winter and a roto tiller that had sat for about three years with gas in it. All three started within 3 to 4 pulls after using this product. This product is absolutely amazing. I would recommend this to anyone with small gas powered engines.
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Size: 4 Fl. oz. Verified Purchase
I bought this product thinking that it would probably not work but I would give it a chance and maybe save me from having to take my lawn equipment in and spend big bucks to get them running after 2 years of sitting up.

I changed the spark plugs and airfilters added "Start your engines" and to my dismay my lawnmower coughed to life on the third pull. It did run pretty rough for a few minutes, but it settled down and has been running great, just like it did when I bought almost 10 years ago. My Stihl edger and blower cranked right up and they actually start better now than they ever did.

I would recommend this product to anyone who asked me.

Start Your Engines! 21205 Fuel System Revitalizer - 4 Fl oz.
Comment 13 of 13 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 4 Fl. oz. Verified Purchase
I never write reviews ever. But this product blew my mind.

I left gas in my snowblower which became stale and the snowblower would not start. I read online that I will need to take apart the carburetor and clean it.

I bought this stuff along with carburetor cleaner and what I needed to clean the carburetor. I was thinking of this stuff as a one in a million but worth it for a chance not to spend my Sunday afternoon fixing the snowblower.

I poured this stuff in the gas tank and it started on the first start. And I can tell you I tried like 50 times last week when there was a blizzard in NY and it would not start.
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Size: 4 Fl. oz.
I have a walk behind weed whacker that I purchased this past year. Even though it had Stabil for ethanol fuel in the tank. It refused to start this season. Not even a sputter. I changed the fuel and put 2 oz of Start! in the tank. First pull nothing, second and third pull ran for a couple of seconds, the third pull the engine fired up and purred like it did brand new.

I'm convinced that it was the Start! since the fresh fuel was from last year also!
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Size: 4 Fl. oz. Verified Purchase
We hadn't used our weed eater in about a year. The weed eater wouldn't start and we tried draining the fuel and putting in new and replacing spark plugs. None of this worked. Start your Engines worked great though and saved us from buying a new weed eater. We've used the weed eater several times now and it's still going strong.
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Size: 4 Fl. oz. Verified Purchase
I was shocked when it actually worked and miraculously started my old lawnmower. However, a few days later it wouldn't start anymore. Do I have to buy a new bottle each time?
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Start Your Engines! 21205 Fuel System Revitalizer, 4 Fl. oz.
This item: Start Your Engines! 21205 Fuel System Revitalizer, 4 Fl. oz.
Price: $9.11
Ships from and sold by Amazon.com