2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 174Get this manual
FUEL SYSTEM
" small amount of fuel may be released when the fuel feed hose is disconnectedPlace container under the fuel feed hose or fuel delivery pipe upper union with shop cloth so that released fuel is caught in container or absorbed in clothPlace fuel soaked cloth in an approved container4Ensure emergency stop switch lock plate is in placeShift into "NEUTRAL" position5Squeeze fuel primer bulb until you feel resistance6Turn ignition switch "ON" for seconds (to operate fuel pump), then turn it "OFF"7Repeat this ("ON" and "OFF") procedure or times to pressurize the fuel system and then check fuel pressure8Check for any signs of fuel leakage9Measure fuel pressure in line at cranking or idle speed operationFuel pressure: Approx255 kPa (2.55 kgcm236.3 psi) 10Stop engine and wait minutesCheck residual fuel pressure in lineResidual fuel pressure: 200 kPa (2.0 kgcm2, 28.4 psi) or moreAs fuel feed line is still under high fuel pressure, make sure to release fuel pressure according to fuel pressure relief procedures mentioned earlierUse the following procedures to remove fuel pressure gauge Place container under joint to catch fuel Cover joint with rag and loosen joint nut slowly to gradually release any residual fuel pressure