2010 Polaris Sportsman 850 Service Manual, Page 59Get this manual
ELECTRONIC FUEL INJECTION ECU RemovalReplacement
12Remove the seat and upper left-hand side panel (see Chapter "Seat and Side Panels")With the ignition turned off, disconnect the wire harness from the ECU by pulling the black slider out away from the ECU while pulling down on the connectorOnce the slider is fully extended, pull the connector from the ECU, using care not to damage the connector or locking mechanism
FUEL PUMP
Operation
NOTE: All EFI units utilize quick connect fuel linesAn electric fuel pump assembly is used to transfer fuel to the EFI system from inside the fuel tankThis assembly includes the fuel pump, regulator and fuel gauge senderThe pump is rated for minimum output of 25 liters per hour at 43 psi and has nonserviceable preliminary 60-micron filterFuel pump is not serviceable, picture for reference only
Regulator
Fuel Gauge Sender