Fuel Pressure Test - Polaris RZR XP Service Manual

EFI / FUEL SYSTEM

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
1. Remove the passenger seat from the vehicle.
2. Remove the plastic fuel pump access cover and lift
up on the fuel pump cover to gain access to fuel lines.
NOTICE
Be gentle when lifting up on the fuel pump cover as the
fuel pump electrical harness is connected and routed
through the "+" shaped pass-through of the fuel pump
cover next to the fuel line opening.
3. Cover the fuel supply line connection at the fuel tank
with a shop towel and disconnect the supply line
from the fuel pump outlet.
4.32
vapors.
4. Install the Fuel Pressure Gauge Adapter in-line
between the fuel pump outlet and fuel supply line.
Fuel Pressure Gauge Adapter:
5. Connect the hose from the Fuel Pressure Gauge Kit
to the test valve on the Fuel Pressure Gauge Adapter.
Route clear hose into a portable gasoline container or
the vehicle's fuel tank.
Fuel Pressure Gauge Kit:
6. Turn on key switch to activate the pump and check
the system pressure on the gauge. If proper system
pressure is observed, the ignition switch, ECU, fuel
pump, and pressure regulator are working properly.
Turn the key switch off and depress the valve button
on the tester to relieve the system pressure.
Fuel Pressure (key on, engine off):
58 ± 2 psi (400 ± 14 kPa)
q
If the fuel pressure is out of specification, verify voltage
to the fuel pump and replace the fuel pump assembly if
battery voltage is observed.
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. Pressure may briefly drop below 58 PSI
(400 kPa) when the throttle is released on a running
9929419 R02 - 2018-2019 RZR XP / XP 4 Turbo S Service Manual
PA-48838
PU-43506-A
NOTICE
vehicle.
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