2008 Cadillac CTS Fuel Sending Unit

You need to use the J 45722 Fuel Sender Lock Ring Wrench.

First, you need to remove the fuel tank to gain access to the primary fuel tank module, disconnect the fuel feed hose quick connect fitting from the primary fuel tank module, remove the fuel feed hose from the retainer on the fuel tank, and position the hose aside, release the interlock and disconnect the electrical connector from the primary fuel tank module and remove the wire harness from the retainer on the fuel tank and position the harness aside. Then, please use the J 45722 and a long breaker bar to unlock the fuel tank module lock ring, by turning counterclockwise. You also need to remove the cam lock ring, partially remove the primary fuel tank module to gain access to the fuel transfer hose quick connect fitting, use care not to damage the float arm, disconnect the fuel transfer hose quick connect fitting, remove the primary fuel tank module from the fuel tank and discard the fuel tank module seal. Finally, you should place the lock ring on a flat surface and measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

First, you need to remove the fuel tank to gain access to the secondary fuel tank module and release the interlock and disconnect the electrical connector from the secondary fuel tank module. Then, please use the J 45722 and a long breaker bar to unlock the fuel tank module lock ring, by turning counterclockwise. You also need to remove the cam lock ring, remove the secondary fuel tank module to gain access to the fuel transfer hose quick connect fitting, use care not to damage the float arm, disconnect the fuel transfer hose quick connect fitting, remove the secondary fuel tank module from the fuel tank, and discard the fuel tank module seal. Finally, you should place the lock ring on a flat surface and measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

You need to use the J 45722 Fuel Sender Lock Ring Wrench.