Page 207 - Manual Oficina Polaris RZR XP 1000 17-18

FUEL SYSTEM

FUEL INJECTORS

OPERATION OVERVIEW FUEL INJECTOR O-RINGS
The fuel rail q, located on the intake manifold, retains
the fuel injectors w to the intake assembly. O-rings on 1. Any time an injector is removed, you must replace the
both ends of the injectors prevent external fuel leaks and upper and lower O-rings.
also insulate the injectors from heat and vibration. 2. Always lubricate NEW injector o-rings with clean,
silicone-free motor oil.
NOTICE
Apply oil sparingly and avoid contaminating the pintle
valve / jet surface and upper inlet port.

3. Install NEW o-rings onto top and bottom of injector
4

When the key switch is on, the fuel rail is pressurized,
and the EFI relay provides voltage to the injectors.
During engine operation, the ECU completes the ground
circuit, energizing the injectors. The valve needle in each
injector is opened electromagnetically, and the pressure
in the fuel rail forces fuel down through the inside. The
“director plate” at the tip of the injector contains a series
of calibrated openings which directs the fuel into the
intake port in a cone-shaped spray pattern. ITEM PART COLOR POSITION
The amount of fuel injected is controlled by the ECU and NUMBER
determined by the length of time the valve needle is held q 1500198 Blue TOP OF
open, also referred to as the “injection duration” or “pulse INJECTOR
width”. It may vary in length depending on the speed and Green or BOTTOM OF
load requirements of the engine. w 5415066 Brown INJECTOR
The ECU gathers fuel injection timing information from
the Crankshaft Position Sensor (CPS) and the Pedal NOTICE
Position Sensor (PPS) to allow for sequential fuel The lower injector o-ring may be brown or green in
injection. color.

IMPORTANT
Always install NEW o-rings when removing the fuel rail
or injectors.

IMPORTANT
Verify that the new top and bottom o-rings are installed
in the correct position and are lubricated with clean,
silicone-free oil.

9928492 R06 - 2017-2018 RZR XP 1000 / XP4 1000 Service Manual 4.13
© Copyright Polaris Industries Inc.