GM 23120358 Fuel Tank Fuel Pump Module Kit (W/O Fuel Level Sensor)

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To check the fuel level sending unit, start by removing it and using an ohmmeter to measure the resistance as the float moves from empty to full. Look for a smooth change in resistance. If there is no resistance or very little change, the sending unit needs to be replaced. To remove the sending unit, first relieve the fuel pressure and disconnect the battery cable. Then, remove the fuel tank and the necessary components in the trunk. Disconnect the electrical connectors and quick-connect fittings for the fuel tank pressure sensor and fuel pump/fuel level sending unit. Use a brass punch or water pump pliers to turn the lock ring counterclockwise and remove the fuel pump/fuel level sending unit module from the tank. Inspect the condition of the o-ring and replace if necessary. If replacing the sending unit, separate it from the fuel pump assembly. Installation is the reverse of removal.

Reassembly is simply the reverse of disassembly.

After testing, relieve the fuel pressure and remove the gauge.