Fuel Pump; Operation Overview; Fuel Sender Test - Polaris RZR 900 2017 Service Manual

FUEL PUMP

OPERATION OVERVIEW

An electric fuel pump assembly is used to transfer fuel to
the EFI system from inside the fuel tank. This assembly
includes the fuel pump, fuel filters, regulator and fuel
gauge sender. The pump is rated for a minimum output
of 25 liters per hour at 58 ± 2 psi (400 ± 14 kPa) and has
two non-serviceable fuel filters.
q
Fuel Line Connection
w
Fuel Pump
e
Fuel Pick-up Filter
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:
9930588 R02 - 2017-2020 RZR 900 900/S 900/S4 1000/S 1000/S4 Service Manual
© Copyright Polaris Industries Inc.
r
Pump / Sending Unit
Electrical Connection
t
Regulator
• 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.

FUEL SENDER TEST

1. Remove the fuel pump assembly from the fuel tank.
Refer to Fuel Pump Replacement procedure.
2. Using an Ohm meter, measure the resistance of the
fuel sender as shown below.
# POSITION
q EMPTY position
w FULL position
Measure between
e
the two pins
3. Allow the sender float to sit in the EMPTY position
and compare to specification.
4. Slowly move the sender float to the FULL position
and compare to specification.
5. If the readings are out of specification, or if the
reading is erratic or LCD display "sticks", check the
following before replacing the fuel pump assembly:
• Loose float
• Float contact with tank
• Bent float rod
FUEL SYSTEM
5
READING
90 ± 4.5 Ω
6 ± 1 Ω
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5.23