Does a 1985 Mercedes-Benz 300D fuel filter causes problems with the injectors bypass hoses?

No, the fuel filter in a 1985 Mercedes-Benz 300D does not cause problems with the injectors bypass hoses. The fuel filter is responsible for removing dirt and debris from the fuel before it reaches the injectors, while the injectors bypass hoses are responsible for returning excess fuel from the injectors to the fuel tank.