2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 161Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 161

500 EFI FUEL SYSTEM FUEL PRESSURE REGULATOR General Information The fuel pressure regulator maintains the required operating
Regulator Test Refer to the "FUEL PUMP TEST" procedure Fuel Pressure Regulator Replacement The regulator is sealed, non-serviceable
assemblyIf it is faulty, the pump assembly must be replacedRefer to the Fuel PumpTank Assembly Replacement procedureWhen
the key switch is on, the fuel rail is pressurized, and voltage is present at the injectorAt the proper instant, the ECU
completes the ground circuit, energizing the injectorThe valve needle in the injector is opened electromagnetically, and
the pressure in the fuel rail forces fuel down through the insideThe "director plate" at the tip of the injector contains
series of calibrated openings which directs the fuel into the intake port in cone-shaped spray patternThe injector is opened
and closed once every other crankshaft revolutionThe total amount of fuel needed for one firing is injected during each openingThe