Fuel Pump Assembly; Operation Overview; Fuel Sender Test; Fuel Pump Test - Polaris Sportsman 850 Service Manual

FUEL PUMP ASSEMBLY

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, regulator and fuel gauge sender.
The pump is rated for a minimum output of 25 liters per
hour at 58 psi and has a non-serviceable preliminary 10-
micron 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:
• 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).

FUEL SENDER TEST

If the fuel gauge reading on the instrument cluster is not
working, or if the display reading differs in large
comparison to the fuel in the tank, perform a resistance
test on the fuel sender.
Disconnect the fuel pump / sending unit connection and
measure the resistance between PIN 1 and PIN 2 on the
fuel pump connector.. If out of specification, replace the
fuel pump assembly.
Fuel Sender Resistance Specifications:
Full: 6 ± 1Ω
Empty: 90 ± 4.5Ω

FUEL PUMP TEST

NOTE
If determined faulty, the fuel pump can be replaced as
an assembly. If a fuel delivery problem is suspected,
make certain the pump is being activated by the ECU
and EFI relay, all electrical connections are properly
secured, the 20A EFI fuse is good, and a minimum of
7.0 volts is being supplied.
CAUTION
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. Couple Fuel Pressure Gauge Adaptor (PS-48762) to
the Fuel Pressure Gauge Kit (PU-43506-A).
FUEL SYSTEM
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