The phrase "new injectors" refers to a specific part of a machine or engine that sprays fuel into the combustion chamber. It means that these injectors have recently been replaced with brand new ones. Full definition
I'd imagine it'll be cheaper to drain the tank than get x number of new injectors. (mechanics.stackexchange.com)
As of 2008, many common rail and unit injection systems already employ new injectors using stacked piezoelectric wafers in lieu of a solenoid, giving finer control of the injection event. (en.wikipedia.org)
I did a lot of stuff in my car like timing chain timing belt water pump thermostat, new injectors seal, and more stuff.. (humblemechanic.com)