Polaris RANGER 500 2018 Service Manual page 320

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6. If the pump did not activate (Step 5), disconnect the

harness connector from the fuel pump. Connect a DC

voltmeter across terminals "3" and "4" in the plug on

the vehicle fuel pump harness. Turn on the key switch

and observe voltage to ensure a minimum of 7 volts is

If the voltage was below 7 VDC, test the battery, ignition

switch, relay(s), wiring harness and ECU.

7. If the reading is between 7 and 14 volts, turn key

switch off and connect an ohmmeter between

terminals "3" and "4"' at the white fuel pump

connector to check for continuity within the fuel pump.

If there was no continuity between the pump terminals,

replace the fuel pump assembly.

8. If voltage at the plug was within the specified range,

and there was continuity across the pump terminals,

reconnect the plug to the fuel pump, making sure you

have a clean connection. Turn on the key switch and

listen for the pump to activate.

If the pump starts, repeat steps 3, 4 and 5 to verify

correct pressure.

9. If the pump still does not operate, check for correct

ECU operation by plugging in a known-good ECU of

the same model.

If the pump still does not operate, replace the fuel pump

9928485 R01 - 2017-2018 RANGER 500 / 570 Service Manual

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