Can you guys recommend a safe injector cleaner?

techtron

X2 ^^^^^

Yep Techron. There are a few others out there that contain PEA, which is the chemical your looking for them to contain. Gumout Regane and Red line SI1 also contain this.

I've had luck with sea foam. But for a real good cleaning Techron

Techron - I have been told that by the guys that work on injectors. It is all that I use in my gas engines.
And I pour a gallon of diesel injector cleaner into my truck once a year with 1/2 a tank of fuel.
And when I change the fuel filter I fill it with injector cleaner.

Some solid info to pass on to whomever. Auto side no where even close to the problems that the marine side for fuel injectors has. Not even close by miles apart in problems. I know because I professionally flow test and clean fuel injectors. Mechanic in the bottle examples sea foam and starting fluid needed then you have deeper issues with the fuel system and or injectors

You can not clean black rubber fuel line, grit, dirt, rust, metal, metal shavings, aluminum oxide, fiber glass dust, dry rotted basket filters, clogged restricted basket filters and so on internally of the injectors by pouring a can of what ever in the fuel tank. Those are the issues more common than fuel varnish that takes place for marine fuel injectors No BS I know first hand.

I second what john has to say, i professionally clean/flow and test injectors on a flowachine at my shop, the 502/454 mpi injectors are the worst, have yet to see a set where there wasnt a high flowing injector and at least one low flowing injector out of 8 or 16, the 500/525 injectors test much better. Ls car injectors rarely flow more than 4% apart , even high mile ones that have set for a year or 2 in junkyard, fwiw, smitty

I am fully convinced merc was fully aware of this and thats why there tunes are so pig rich when i dyno a motor or test/tune one in a boat with 02 sensors