Fuel Pressure Regulator
Install Pressure Gauge (VW 1318 ) and Adapter (VW 1318-17 ) in fuel delivery line. Operate engine at idle speed with valve on test equipment closed. Pressure should be 29 psi (2.0 kg/cm2 ) with pressure regulator vacuum hose connected and 36 psi (2.5 kg/cm2 ) with vacuum hose disconnected.