Removal Procedure

CAUTION: Whenever fuel line fittings are loosened or removed, wrap a shop cloth around the fitting and have an approved container available to collect any fuel.

NOTE: Clean all fuel pipe and hose connections and surrounding areas before disassembling to avoid possible contamination of the fuel system. Spray the fuel pump module cam-lock ring tang with penetrating oil prior to attempting removal.

Remove the fuel tank. Refer to Fuel Tank Replacement .
Remove the secondary fuel pump module. Refer to Fuel Tank Module Replacement - Secondary .

Fig 1: View Of Fuel Tank Module

Courtesy of GENERAL MOTORS CORP.

Disconnect the electrical connectors from the primary fuel pump module and fuel tank pressure sensor.

Fig 2: 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 or screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation.

Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring.
Disconnect the fuel feed and vent lines from the fuel tank.

NOTE: To prevent bending of the sending unit float arm during removal, lift the pump module up slightly to disengage the orientation tabs in the tank and rotate the module 45 degrees.

Remove the primary fuel pump module assembly.

IMPORTANT: Always replace the fuel pump module-to-tank seal, O-ring, when the fuel pump module is removed.

Discard the fuel pump module-to-tank seal.
If the fuel level sending unit is being replaced, remove the fuel level sender. Refer to Fuel Level Sensor Replacement - Primary .

Fig 3: Checking Lock Ring For Flatness

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Some lock rings were manufactured with "DO NOT REUSE" stamped into them. These lock rings may be reused if they are not damaged or warped.

IMPORTANT: Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring.

IMPORTANT: Check the lock ring for flatness.

Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.