Diaphragm damper / pulsation damper for Porsche 928 S. Engines M28.19/20/21/22/43/44/45/46 This damper is installed in the front area of the engine compartment. The flow line is connected to the lower connection. The two horizontal connections lead to the injection rails. You can find the matching fuel hoses as well as the vacuum connector and vacuum pipe in my other offers. The fuel pressure regulators can be found under article number PKSDR.