To put things bluntly; yes, fuel injector cleaner does work, but only if you're using it correctly. ... As explained earlier, it is able to remove carbon and other deposits in fuel lines, but in Techron it is added in low quantities, meaning it can take up to 5 full tanks of fuel before deposits are removed.

How long does injector cleaner take to work?

Although fuel injector cleaner starts working as soon as you put it into your vehicle's tank, it takes time for the effects to become noticeable. You should begin seeing results within 100 – 300 miles after you use fuel injector cleaner.

Will fuel injector cleaner harm my engine?

What Happens If You Put Too Much Fuel Injector Cleaner? It is possible to give a car too much of a good thing and add too much fuel injector cleaner. If this happens, you can risk damaging the lining of the fuel tank. Also, you may notice that there is lowered engine performance and fuel efficiency.