Liebherr LR11350 Fuel Contamination

Hello to all guru we have a Liebherr LR11350 which fuel getting black always and its my second time already i renewed it. 1350 H and i afraid that i will be a black fuel again. Local service center told me that injector should be replace and we ordered already waiting for delivery. Do its right its come from injector?

thanks for the help in advance

Liebherr LR11350 Fuel Contamination