Hyundai 31111-09000 Pump-Fuel

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To relieve the fuel system pressure, disconnect the cable from the negative battery terminal. Remove the air filter housing and disconnect the fuel pressure regulator valve electrical connector. Take out the ignition coil from cylinder number four and remove the canister purge control solenoid valve. Disconnect the fuel supply line quick disconnect fitting and use a special tool to remove the nut from the high pressure fuel pump and delivery pipe. Remove the junction block and then the high-pressure fuel pipe. Be cautious and discard the pipe, obtaining a new one. Unscrew the fuel pump mounting bolts evenly and discard them, obtaining new ones. Remove the high-pressure fuel pump from the cylinder head. Rotate the engine until the lifter for the high pressure pump is at the lowest point. Apply engine oil to the high-pressure pump O-ring and set the pump on the cylinder head. Install new bolts and tighten them. The remainder of the installation is the reverse of removal.

Disconnect the electrical connector from the engine coolant temperature sensor.

Reassembly is the reverse of disassembly. Install the fuel pump/fuel level sending unit back into the fuel tank.

Have an assistant cycle the ignition key On and Off while listening for the sound of the fuel pump operating inside the fuel tank. Alternatively, remove the rear seat cushion and fuel pump access cover to listen to or feel the top of the fuel pump module for a "whirring" sound.

Remove the fuel high pressure line flange bolt and loosen the fuel return hose clamp, then disconnect both the line and the hose.

In a return-type fuel system, the fuel pump should run for two seconds when the ignition is turned on, and the pressure should remain steady.

Remove the retaining bolts from the fuel pump/fuel level sending unit mounting flange. Carefully lift the fuel pump/fuel level sending unit assembly from the fuel tank.