5
9850068 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.
5.25
FUEL PUMP OPERATION OVERVIEW
When the key switch is turned to "ON", the ECU
activates the fuel pump, which pressurizes the system for
start-up.
The ECU switches off the pump preventing the continued
delivery of fuel in these instances:
• If the key switch is not promptly turned to the "start"
position.
• If the engine fails to start.
• If the engine is stopped with the key switch "on" (as in
the case of an accident).
In these situations, the “check engine” light will go on, but
will turn off after 4 cranking revolutions if system function
is OK. Once the engine is running, the fuel pump remains
on.
As boost pressure increases, fuel pressure increases
due to the manifold pressure controlled fuel regulator. It
is NORMAL to see fuel pressure fluctuations as the
throttle varies.
FUEL PRESSURE TEST
NOTICE
This test applies to non-EVAP models only.
IMPORTANT
As boost pressure increases, fuel pressure increases
due to the manifold pressure controlled fuel regulator. It
is NORMAL to see fuel pressure fluctuations as the
throttle varies.
If a fuel delivery problem is suspected, make certain the
fuel pump pickup filter in the tank is not plugged, that the
fuel pump relay is being activated by the ECU, all
electrical connections are properly secured, the fuses
are good, and a minimum of 7.0 volts is being supplied. If
during starting the battery voltage drops below 7.0 volts,
the ECU will fail to operate the system.
WARNING
Fuel is extremely flammable and may cause severe
burns, injury, or death.
Do not use any device that produces a flame or
electrical devices that may spark around fuel or fuel
vapors.
1. Remove both seats from the vehicle.
2. Remove upper and lower rear close off panels.
3. Cover the fuel supply line connection at the fuel tank
with a shop towel and disconnect the supply line
q
from the fuel pump outlet.
EFI / FUEL SYSTEM
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