You need to remove the fuel tank to access the fuel pump.There is a special socket to remove the pump from the fuel tank but I just use a hammer and large flat head screw driver instead.You will need a set of metric sockets and and medium length extension.here is the service info to replace the pump.
Fuel Sender Assembly Replacement (Malibu Sedan)
J 45722 Fuel Sender Lock Ring Wrench
Caution: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always replace the fuel sender gasket when reinstalling the fuel sender assembly.
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: 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.
Notice: Refer to Fastener Notice in the Preface section.
Tighten Tighten the bolts to 20 N·m (15 lb ft).
Notice: Refer to Component Fastener Tightening Notice in the Preface section.
Tighten Tighten the clamp to 4 N·m (35 lb in).