2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 58Get this manual

2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 58

ELECTRONIC FUEL INJECTION Fuel PumpFuel Tank Installation 123456789Reinstall the fuel tank assembly through the right sideConnect
of the injector contains series of calibrated openings which directs the fuel into the intake port in cone-shaped spray patternThe
amount of fuel injected is controlled by the ECU and determined by the length of time the valve needle is held open, also
referred to as the "injection duration" or "pulse width"It may vary in length depending on the speed and load requirements
of the engine FUEL INJECTORS Operation Overview The fuel injectors mount into the Integrated Air Fuel Manifold (IAFM), and
the fuel rail attaches to the top end of themReplaceable O-rings on both ends of the injector prevent external fuel leaks
and also insulate it from heat and vibrationPressure Valve Damper Fuel Injectors 10Reconnect the negative cable to the battery11Install
the upper side panels and seat (see Chapter "Seat and Side Panels")12Test the fuel pump by turning on the key and listening
for the pump to activate FUEL PRESSURE REGULATOR Operation Overview The fuel pressure regulator maintains the required operating