Fuel Lines - Quick Connect; Electronic Fuel Injection; Principal Components / Efi Operation Overview - Polaris 2011 RANGER RZR Service Manual

Fuel Lines - Quick Connect

1. Place a shop towel around the fuel line to catch any
dripping fuel. Squeeze the connector tabs together and
push the locking slide back.
Squeeze Connector Tabs
Squeeze Connector Tabs
Fuel Rail
2. Pull on the fuel line for removal.
3. To install the line(s), verify the connections are clean and
free of debris.
4. Snap the fuel line back over the nipple and slide the locking
mechanism back into place. Verify the connector tabs snap
back into place.
9923142 - 2011 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2010 Polaris Sales Inc.

ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION
Principal Components
The Electronic Fuel Injection (EFI) system is a complete engine
fuel and ignition management design. This system includes the
following principal components:
• Fuel Pump
l
• Fuel Rai
• Fuel Line
• Fuel Filter(s)
• Fuel Injectors
• Pressure Regulator
• Throttle Body / lntake Manifold
• Engine Control Unit (ECU)
• Ignition Coils
• Engine Coolant Temperature Sensor (ECT)
• Throttle Position Sensor (TPS)
• Crankshaft Position Sensor (CPS)
• Temperature and Manifold Absolute Pressure Sensor
(T-MAP)
• Camshaft Phase Sensor
• Idle Air Control Motor (IAC)
• Wire Harness Assembly
• Check Engine Light
EFI Operation Overview
The EFI system is designed to provide peak engine performance
with optimum fuel efficiency and lowest possible emissions.
The ignition and injection functions are electronically
controlled, monitored and continually corrected during
operation to maintain peak performance.
The central component of the system is the Bosch Electronic
Control Unit (ECU) which manages system operation,
determining the best combination of fuel mixture and ignition
timing for the current operating conditions.
An in-tank electric fuel pump is used to move fuel from the tank
through the fuel line, to the fuel rail. The in-tank fuel pressure
regulator maintains a system operating pressure and returns any
excess fuel back into the tank. At the engine, fuel is fed through
the fuel rail and into the injectors, which inject into the intake
ports. The ECU controls the amount of fuel by varying the
length of time that the injectors are "on." This range can vary
depending on fuel requirements. The controlled injection of the
fuel occurs every other crankshaft revolution, or once for each
4-stroke cycle. The total amount of fuel needed for one firing of
a cylinder is injected during each cycle. When the intake valve
opens, the fuel/air mixture is drawn into the combustion
chamber, ignited and burned.
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