Removal Procedure

Remove the fuel tank. Refer to Fuel Tank Replacement .
Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. See Special Tools . Turn the fuel sender lock ring in a counterclockwise direction.

Fig 1: Identifying Lock Ring
Courtesy of GENERAL MOTORS CORP.

NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring.

NOTE: Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints.

IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation.
Remove the fuel sender assembly (2) and the seal (3). Discard the seal.

Fig 2: View Of Fuel Sender Assembly Components
Courtesy of GENERAL MOTORS CORP.

CAUTION: Drain the fuel from the fuel sender assembly into an approved container in order to reduce the risk of fire and personal injury. Never store the fuel in an open container.
Clean the fuel sender sealing surfaces (4).
Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points.

Fig 3: Checking Lock Ring For Flatness
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
- Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped.
- Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring.
- Check the lock ring for flatness.
If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.