4.10
FUEL INJECTION
FUEL PUMP
Operation Overview
NOTE: All EFI units utilize quick connect lines. Fuel
Tank / Pump Assembly is a non-serviceable item and
must be replaced if determined to be at fault.
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 39 psi and has a non-
serviceable internal 30-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, or
• 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 Pump Test
NOTE: FUEL GAUGE SENDER TEST - To test fuel
gauge sender function, refer to Chapter 10.
The fuel pump/tank assembly is non-serviceable and must be
replaced if determined to be faulty. If a fuel delivery problem is
suspected, make certain the filter is not plugged, that the pump
is being activated through 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.
1. Remove the fuel rail end cap (damper).
2. Connect the fuel rail end cap (damper) onto adapter PU-
47476 and install on the fuel rail.
3. Attach Polaris pressure tester PU-43506. Route the tester
clear hose into a portable gasoline container or the
equipment fuel tank.
4. Turn on the key switch to activate the pump and check the
system pressure on the gauge. If system pressure of 39 psi
3 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.
NOTE: If the pressure is too high or too low, replace
the fuel tank assembly.
Example Shown.
Fuel pump not replaceable.
For reference only.
Regulator
Fuel Pump
Internal 30 Micron
Strainer (Bottom)
Fuel Gauge Sender
WARNING
Check the fuel test valve for any possible fuel
seepage after performing any tests or procedures.
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.
Normal Fuel Pressure: 39 psi. ± 3
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