2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 171Get this manual
FUEL SYSTEM 5-3
FUEL PRESSURE RELIEF PROCEDURE
After making sure that engine is cold, relieve fuel pressure as follows1Turn OFF ignition switch2Remove the three (3) bolts and fuel hose guard 1
3Disconnect high pressure fuel pump lead wire connector at high pressure fuel pump