How do your remove air from injector lines on Audi 90 MODELS?

To remove air from the injector lines on an Audi 90, first, ensure that the fuel system is primed by turning the ignition key to the "on" position without starting the engine for a few seconds to allow the fuel pump to pressurize the system. Then, locate the fuel injectors and loosen the injector line nuts slightly while cranking the engine until fuel begins to seep out, indicating that air has been purged. Tighten the nuts once fuel flows steadily without air bubbles. Finally, start the engine and check for any leaks.