Gumout510011 Multi-System Tune-Up, Fuel Stabilizer Injector Cleaner & Gas Treatment, 16 oz, Full Fuel System Cleaner - Improves Engine Performance, Cleans & Removes Deposits and Residue

What else is there to say? This is a great multi-purpose product that has been a mechanic's choice for years. It works exactly as advertised—cleans the fuel system, helps reduce rough idling, and can even improve mileage with regular use. I've used it in both gas and diesel engines without any issues. Definitely a solid value, especially when buying online—much cheaper than what you'll find at most big box stores. If you maintain your vehicles yourself, this is one of those must-have items on the shelf.

I recently had the engine and transmission mounts replaced in my 2006 direct injected Audi 2.0 turbo car at 218K due to idle vibrations and decided to tackle the gas fumes I had been experiencing over the past 5 years in my car while backing up. I tried Liqui Moly Jectron for a week then I came across the DI Jectron version for direct injection engines on the Liqui Moly website I tried the next week. The gas fumes changed from a gas smell to like a sweeter smell with the DI Jectron but on the last 1/4 of tank I got a P0171 code while having to slow down to about 45 mph on a mountain in traffic and then accelerating back up to speed slowly. After clearing the code and adding the Gumout Tune-Up the next morning I tried to duplicate the issue in the same area for two days on the way back from work and the code did not come back. I also noticed less friction in the fuel system with the Gumout product while slowing down and accelerating so I may have has some gunk in the system after the car mostly sat for 2 years during COVID with the ethanol fuel we have in California. The Gumout Tune-Up also cleared up the gas fumes as I am not smelling it anymore and the car is running almost like new. I will continue to use the CRC intake valve and turbo cleaner spray or the Gumout Tune-Up to clean the valves before oil changes and the Gumout Tune-Up every 2 months for the fuel system as I believe these high pressure pump systems need some kind of lubricant in them with the ethanol in the fuel. I may also use 4 ounces of Marvel Mystery oil in the tank again on regular fill ups like I used before COVID to keep the system lubricated. Gumout makes a great product at a great price.***Update the gas fume smell came back on the 3rd day of Gumout, I am going back to the Liqui Moly DIJectron.****

I use this product often when I fill up with gasoline. Use it to keep the fuel injectors clean.Seems like it works good.Bought it on Amazon at a good price. Another honest review.

Great product but both cans have multiple dents - delivered by USPS and left by garage instead of front door.

This is the only product I’ve found that has enough P.E.A. to clean and prevent the excessive carbon buildup that the Mini Cooper turbo engines are notoriously known for. I run a full bottle through the gas tank just before each oil change and use a third of a bottle in the gas tank at each fill up for maintenance in between oil changes. I have a 2010 Mini Convertible & a 2014 Countryman. Keeps both cars running like new.

I had heard about this stuff from the Scotty Kilmer channel and Engineering Explained on YouTube. I have recently been on a spirit quest to do excellent preventative maintenance on my 2007 Nissan Altima 2.5 S now that I am using it for Uber and Lyft; driving about 1000 miles more a month than I used to. I read recently about the Top Tier rating system for fuel products and I realized with a sink in my stomach that for the past 37000 miles, I have been filling up at the Pilot gas station that is five minutes away from my house and it is a non-Top Tier station. My car had had no problems with the engine or fuel system and still hasn't (knock on wood), but regardless I wanted to do something to try to correct 37000 miles of the gasoline sin of using non-Top Tier gas that lacks the amount and quality of detergents that your Top Tier stations like Shell and Chevron have.I drove my car to nearly empty and pulled into the Shell gas station nearest me. Given that I have a twenty gallon capacity tank, I dumped the entire bottle of the Gumout into my fuel tank and added a fill of gasoline–17.86 gallons–on top of it to mix it in as the instructions said to do. I then drove my car to nearly empty with the Gumout/Gas mixture and just did my second fill up with only a Top Tier gasoline.Because my car had no problems like rough idle, slow acceleration, or what have you to begin with, I cannot say I have "noticed" any difference; but that doesn't mean there wasn't. For seven bucks and being approved by many reputable mechanics, I don't think my money was wasted and now that I am using Top Tier gasoline only I feel better about the longevity and reduced need for repairs my car is hopefully going to have. In summary: My car didn't have anything noticeably wrong that would allow me to observe a noteworthy improvement, but it didn't hurt my car either as far as I can tell; and it has the right cleaners and such for modern fuel injected vehicles.With that uninspiring part of my review over, I can now get on to the really cool NOTICEABLE benefit this stuff had: it was the Dr. Frankenstein to my mower that had been sitting unused too long!I went out to the ranch I manage to do some mowing and to my disappointment, the mower was dead and would not even start. I replaced the battery and was able to get it to start, but the idle was extremely rough and within a minute it spluttered and died. Noticing that the tank was maybe only 10% full, I went and got five gallons of fuel and added about 5 ounces of Gumout as per the instructions for four stroke small motor gasoline. I filled the mower up, shook the mower and let it sit for a minute, went to start it up, and COUGH PUTT COUGH PUTT COOUGHH VROOOOOOOOOOOOMMMMM!!!!! That baby coughed whatever gunky fuel and deposits had clogged up the fuel line or something and fired up! It ran smoothly from startup to intentional shutdown and I knew that I had the Gumout to thank for that. A further benefit of the Gumout too is that it is apparently a fuel stabilizer, so the other 2.5 gallons that is going to sit untouched in the can for up to four months is going to be good to go!All in all, I am pleased with the stuff. Be an educated purchaser: do your research and make sure it is going to be correct and useful for your application, but sometimes it is just fun to use "snake oil" type items like this and just see what happens (when they have been approved for safety by the appropriate agencies when used according to instructions, of course).Thanks for reading my review, I hope it helps you to make your purchasing decision!

works well, effective formula

This stuff works great! I’m a mechanic with over 35 years experience and this is my favorite go to for small engines.I recently restored a 1994 Kawasaki Vulcan 750 after it sat for 16 years.Cleaned the carburetors in the ultrasonic cleaner and rebuilt them.The bike was re-jetted for a Aftermarket exhaust and air filters.After getting the bike to run it still had a fuel delivery issue the the front cylinder carburetor and tried various other products hoping I wouldn’t have to remove the carburetors again because it’s not a fun job,nothing seemed to help much as the engine wouldn’t rev out completely.I added a few oz of this product to the fuel tank and the bike let it warm up then held the throttle wide open and it started to rev out and eventually it cleared up and now revs out completely.There must have still need a blockage of some sort in the main Jet circuit of the carburetor and the gumout cleared it out.