Fuel injectors, which deliver precise amounts of gasoline or diesel to each cylinder exactly when it's needed, are in the vast majority of vehicles sold today. While providing this all-important go juice, the fuel injectors can get quite dirty over time, and in order for them to operate at their best, they need to be cleaned intermittently. The easiest way to clean your dirty fuel injectors is with a special solution designed for this task.
"Fuel injector cleaners, and more general fuel system cleaners, are fuel additives that help you clean the fuel system," says Fabio Rosato, founder of Roadologist.com, a site dedicated to helping readers improve their automotive knowledge and driving skills. Rosato has a background in engineering that he supplemented with automotive research. "They are basically fluids that you pour into the gas tank that dissolve the buildups."
When fuel passes through the injectors, the fuel injection system cleaner gets rid of any leftover gunk that's formed. "Using a good fuel injector cleaner can solve the buildups, thus restoring your engine to its original condition," Rosato says. "This, in turn, restores fuel economy (miles per gallon) and responsiveness upon acceleration."
Here are some of the best fuel injection cleaners, based on expert opinions and customer satisfaction ratings.
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When it comes to fuel injector cleaners, the type of vehicle you drive matters less than the type of engine that powers it. Again, most vehicles in the US have gasoline-powered engines, but some are powered by diesel engines. Older vehicles may use carburetors, which means they won't even have fuel injectors.
What makes the Chevron Techron Concentrate Plus fuel system cleaner so popular (it's the top cleaning product on Amazon) is that it works in all kinds of vehicles - cars, trucks, motorcycles, SUVs and more - so long as they run on gasoline. Chevron makes a different Techron product for diesel engines. Between the cleaner's versatility and its high customer ratings (Amazon users have given it a 4.6 out of 5), it's no wonder that analysts and consumers alike swear by it.
Chevron Techron Concentrate Plus contains polyetheramine, or PEA, an ingredient that aids in cleaning and helps make the product so effective. It allows the cleaner to erode the carbon deposits that build up as a result of normal usage, and thereby help the engine (and the vehicle) run more efficiently.
One final note: This product is an entire fuel system cleaner, not just a fuel injector cleaner, which means it's designed to clean out the entirety of your vehicle's fueling system, including your fuel lines and fuel pump. Chevron also sells a Techron Concentrate Plus designed just for fuel injectors, which has less PEA and is less expensive.
Comparison of best fuel injector cleanersWhat you need to know about cleaning your fuel injectors
While there is a difference between fuel system cleaners and fuel injector cleaners, the former can typically be used in place of the latter. In fact, many drivers prefer to use full fuel system cleaners, as they're often stronger than cleaners designed specifically for fuel injectors. Fuel injector cleaners, on the other hand, are typically a bit cheaper than their full-system counterparts.
There are a few ways to tell if it's time to clean your fuel injectors. Your car's gas mileage may dip, and may have a rough idle due to dirty injectors. Your engine may stall or have difficulty starting. As far as how long it will take to fix those problems, it really depends on your fuel injector cleaning product. Higher-quality cleaning-fluid products will lead to improvement after fewer applications than others - you may even see improvement after running through just a single tank of fuel. A severely clogged fuel injector may need to be sent to a cleaning service for ultrasonic cleaning before your engine can return to proper working order.
You also don't need to wait until you have a problem before you decide to clean your fuel injectors - regular maintenance can save you the trouble of a poor-performing vehicle. By using a cleaner every 1,550 miles on a gasoline engine (or with every tank for a diesel engine), you can get rid of sediment buildup before it reaches a noticeable level, and avoid the symptoms associated with clogged injectors. You should note, however, that using a cleaner every 1,550 miles is simply a rule of thumb, and many products have their own specific instructions associated with frequency of use for optimal fuel-injection cleaning.
Fuel injector cleaners are just one kind of fuel additive, or product that can be added to your fuel to affect your vehicle's performance and overall condition. There are other additives that affect the fuel itself. For instance, a fuel stabilizer can be added to a car that won't be used for a long period of time in order to preserve the gas and prevent it from causing damage to the engine.
There's no harm in adding fuel injector cleaner and fuel stabilizer to the same gas tank. "Most fuel injector [or] system cleaners actually double up as fuel stabilizers: They preserve and clean the fuel so that it doesn't go bad after some time without using it," says Rosato. "These cleaners are actually recommended if you plan on leaving your car parked for a long period of time."
Even if a fuel injector cleaner isn't also a fuel stabilizer, it's still OK to leave it in your tank for extended periods of time. "Generally speaking, however, even if you use a particularly strong cleaner, you just pour it into the fuel reservoir," says Rosato. "If you don't use your vehicle the cleaner is just going to stay there in the reservoir and do nothing 'actively.' So, unless you're pouring lava into the reservoir, you can just relax. The worst that could happen is that the cleaner goes stale and becomes useless after quite some time. Nothing to be worried about."
Some consumers also express concern about whether or not fuel injector cleaners can be used in turbocharged or supercharged car engines. "The simplest and safest answer is to look up what the manufacturer of the vehicle recommends," says John Burkhauser, director of education at Bolt On Technology and an auto repair specialist with over 35 years of experience. He has been published in the US and Europe. "My opinion is using these additives properly for normal street driving is acceptable."
Finally, when it comes to selecting the best fuel injector cleaner, your vehicle type will affect your choice, but certain features are universally helpful - namely, the presence of PEA and the shape of the container. PEA is especially effective when it comes to dissolving sediment and cleaning engines, and its presence should be a priority in your selection. (Many reputable cleaner brands will make their products' ingredients public via safety data sheets.) Additionally, some containers have spouts and are measured to exact application amounts, making pouring easier.
Five things to know before using fuel injector cleaner on your vehicle
- Are you experiencing vehicle performance or fuel consumption issues? If so, you may have dirty fuel injectors and it might be time for a cleaning. Even if you aren't, you should consider using fuel injector cleaner every set number of miles - 1,550, or whatever amount is recommended by the cleaner manufacturer.
- How severe are the problems you're experiencing? If they greatly impact your driving - or if you don't see any improvement after fuel injector cleaner treatment - you may need to skip straight to ultrasonic cleaning.
- What kind of engine does your vehicle have? Most have gasoline engines, but diesel engines also represent a significant percentage of vehicles on the road. You'll need to get a cleaning product specifically designed for your type of engine.
- Do you want a fuel system cleaner or a fuel injector cleaner? Again, fuel system cleaners are typically stronger since they need to clean all parts of the system, but fuel injector cleaners are usually cheaper.
- Does the cleaner you're considering contain polyetheramine? PEA is an ingredient that makes fuel system and injector cleaners more effective, and many drivers won't consider a fuel cleaner product that doesn't have it.
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Written by Scott Fried for Roadshow.