Hello, You will need to remove the fuel tank to get to the pump. GM has a special tool to remove the metal retaining ring that holds the fuel pump module in the tank, but a hammer and chisel will do the same job if you are careful. But do be careful of the fuel lines and connections as they are plastic and break real easy. I will post the tank removal first and then post the pump removal from the tank. Thanks
Important: Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.
Notice: Do not bend the fuel tank straps. Bending the fuel tank straps may damage the straps.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the bolts to 40 N·m (30 lb ft).
Tighten Tighten the clamps to 2.5 N·m (22 lb in).
Tighten Tighten the bolts to 12 N·m (106 lb in).
J 45722 Fuel Sender Lock Ring Wrench
Notice: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring.
Notice: 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.
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.
Important: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. DO NOT apply any type of lubrication in the seal groove.Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction.