2008-2010 Kawasaki KFX450R Factory Service Manual, Page 124Get this manual
FUEL SYSTEM (DFI) 3-67 Fuel Line
The gauge needle will fluctuateRead the pressure at the average of the maximum and minimum indicationsIf the fuel pressure is much lower than specified, the fuel pressure regulator in the fuel pump have been clogged or stuckReplace the fuel pump (see Fuel Pump section)If the fuel pressure is much lower than specified, check the followingFuel Line Leakage Amount of Fuel Flow (see Fuel Flow Rate Inspection) If the fuel pressure is much lower than specified, and if inspection above checks out good, replace the throttle body assy, or the fuel pump and measure the fuel pressure again (see appropriate sections)Remove the fuel pressure gauge, hoses and adapterInstall: Fuel Hose (see Fuel Hose Replacement in the Periodic Maintenance chapter) Fuel Tank (see Fuel Tank Installation)
Fuel Flow Rate Inspection NOTE