Model # 2-024-1

Internet #204331519

Mechanic in a Bottle 24 oz. Synthetic Fuel Additive
0856202002751

Mechanic in a Bottle

24 oz. Synthetic Fuel Additive

  • Works with 2- and 4-cycle engines
  • Revitalizes old fuel
  • EPA-registered
$18.99 /each

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Product Overview

Fix poor or non-running engines with the 24 oz. Synthetic Fuel Additive. It works in your power equipment with 2- and 4-cycle engines. It removes all varnish in the fuel system without having to take out the carburetor. It removes carbon deposits and water, reconditions rubber and plastic components and revitalizes old fuel. Use this additive to rejuvenate your equipment's fuel system so it starts efficiently and operates in top condition.

  • Treats up to 24 engines, 2- or 4-cycle
  • Lets you quickly fix engines without removing the carburetor, avoiding costly repairs
  • Reconditions rubber and plastic components and rejuvenates rubber gaskets that may have dried out from ethanol to keep the engine in top working condition, avoiding repairs and downtime
  • Removes water that causes corrosion and poor running
  • Restores old, decayed fuel by breaking down carbon deposits and adding an octane booster to replace lost octane
  • EPA-registered

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2 Questions4 Answers

Customer Questions & Answers

24 oz. Synthetic Fuel Additive
24 oz. Synthetic Fuel Additive

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Can I use your products on outboard boat engines?

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South Salem, N.Y.
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May 28, 2015
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August 5, 2016
Answer: 
Yes, both Mechanic in a Bottle and Ethanol Shield can be used in outboard motors and all other gasoline engines.
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Asked by
Eagle, WI
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Home Improvement Profile: DIYer
June 10, 2015
Answer: 
I see no reason why not. I've used it successfully on both 2 and 4 cycle motors. After spending a lot of time on both motors - carb cleaning/adjusting, plug replacement, point, capacitor & magneto coil placement (4 cycle) - I tried this product as a last resort. Both motors now run fine. Not sure why! Magic???
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May 28, 2015
Answer: 
This could be used on outboard engines.
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Should i empty the fuel ?

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Carol Stream
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November 25, 2015
I am planning to use it in snow blower, should I empty the fuel tank or should I add with the fuel?
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Answer (1)

August 5, 2016
Answer: 
Most owner’s manuals for power equipment do recommend to drain the fuel tank. This is for two reasons. The first is that gas will go bad in a short amount of time. The manufacturers do not want their customers to have issues with bad gas. In addition to this, warranty will not cover gas related failures.
The second reason is for safety. If the fuel system leaked, it could cause a fire hazard.
Using Read More
Most owner’s manuals for power equipment do recommend to drain the fuel tank. This is for two reasons. The first is that gas will go bad in a short amount of time. The manufacturers do not want their customers to have issues with bad gas. In addition to this, warranty will not cover gas related failures.
The second reason is for safety. If the fuel system leaked, it could cause a fire hazard.
Using Ethanol Shield in the fuel will keep the fuel fresh for 1 year. But it is still recommended to follow the manufacturer’s instructions. Even if the fuel system is drained, a small amount of gas is left in the carburetor/fuel tank and can cause issues if left untreated. When Ethanol Shield is used, the fuel system is protected. Read Less
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Customer Reviews

24 oz. Synthetic Fuel Additive is rated 4.5 out of 5 by 27.
Rated 5 out of 5 by from Don't junk your mower yet!! I am not a mechanic. But I do know how to maintain a mower. Lately mine has been difficult to start. When it does it smokes, runs rough and lacks the power it use to have. I cleaned the gas tank, changed the plug, air filter, and oil but still ran the same. Finally I put some "Mechanic In A Bottle" right down in the carburetor and let it set a while. Then added some to the tank and started it up. The first time it sputtered a bit then but then took off! I am amazed as to how much better and smoother my mower runs now! Clean starts, almost no smoke, runs a lot smoother and it has the power it use to have. Take it from an average Joe: Give this product a try before you get rid of your mower. You may be surprised!
Date published: 2016-08-08
Rated 5 out of 5 by from Worked well I was a little skeptical at first that it could do what it said but it worked. I added it to the tank because the mower was running but it was hunting so i thought i would give it a try before tore the carb apart . I ran it for about and hour . It seem to help but not get everything out . So i let it set for about week because i got busy and rain . Started it week later and bam it was not hunting at all. So im happy
Date published: 2016-08-02
Rated 5 out of 5 by from testing I let sleds, jet skis, generators and motor cycles with many gallons of fuel go stale . Seemed like a good idea to try out .
Date published: 2016-08-09
Rated 5 out of 5 by from Works better than advertized I used this in gas tank on my Artic Cat ATV that had been set up for 2 years. It cleaned out my carb. with one treatment. It now will idle and the more it runs the better it gets. I am sold on this product and will use it in all my motors. Works great in 2 or 4 cycle engines. I added some to the little bit gas that was still in the tank. I then started the motor using starting fluid, then kept it running for 20 min then turned it off and let it sit for 2 days. I had to use starting fluid to restart it again I also filled the tank with fresh gas it still ran very rough for about 10 min. the longer it ran the better it got. It will now start without starting fluid and it will now Idle again and keep running without the throttle being held open. Saved me a lot of money over a carb. rebuild or replacement.
Date published: 2016-04-05
Rated 5 out of 5 by from The only thing I can say is that this stuff works! I am amazed! It saved me from replacing/rebuilding the carburetor. I had a 23 year old snowblower that sat with gas in it for 9 years. It would only start if I kept pressing the primer bulb and kept it in full choke. I dumped out most of the fuel, and added 4 oz of MIB to the tank so that it was about 10oz of fuel/MIB mixed. I started it and ran for 10 minutes (while pressing the primer bulb to keep the engine running on full choke) to get the mixture deep into the carburetor. I then let it sit for a week. After one week I restarted it and it got progressively better to the point it runs without the choke on at all. This saved me from replacing or rebuilding the carburetor. I didn't think it would work, but it did! Great product!
Date published: 2015-03-27
Rated 5 out of 5 by from Small engine shop We use this product in our heated ultra sonic cleaning machine for internal cleaning of all 2-cycle engine carburetors. First clean the exterior surfaces of the carburetor in your parts washer. Disassemble the carburetor. No need to remove the welsh plugs. Use "Mechanic In A Bottle" full strength in your ultra sonic machine heated to 110 degrees F for 20 to 25 minutes. Re-assemble the carburetor. In most cases the metering valve, the fuel pump and their gaskets will not need replacing unless they are damaged. We have experienced a 98% success rate using the above method for cleaning hand held equipment carburetors! The MIB can be re-used for numerious cleanings.
Date published: 2014-01-24
Rated 5 out of 5 by from Surprisingly Effective Wonderful product. Have a Craftsman Lawn mower that I rebuilt the carburetor on a couple of times and it was still running rough, got tired of it and just dealt with it running poorly. Engine revving and dropping, difficult starts, randomly shutting off, and backfiring hard when turning off. Poured in 2oz of this stuff, ran it for about 5 minutes and quickly heard the change in the engine sound, its running wonderfully now. This isn't some snake oil, it really did help. At $20 it seems like a stiff price, but seeing as they recommend 1 oz per tank, it really will go a long way. Find it when its on sale and you've got yourself on heck of a bargain.
Date published: 2015-05-07
Rated 1 out of 5 by from Absolutely did not work on small lawn equipment I have several two and four cycle engines, mainly blowers and weed trimmers. I used the product as directed on all of them with no results. One of the blowers would start prior to using the product, it just wouldn't maintain power and stop. Of the four engines I attempted to use it on 2 two cycle and 2 four cycle, none of them had any positive results.
Date published: 2016-04-26
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