Variable gas consumption and stalling definitely sound like an issue with the fuel pump relay! The 2003 Pontiac Aztek fuel pump relay is located under the car’s hood in the relay box. You may also find fuses in this box.
If you cannot find its exact location, refer to your owner’s manual. A quick Google search may return an online version if you don’t have the hard copy anymore.
However, if you’re unsure whether the fuel pump relay is the cause of the issue, make a note of other symptoms you’re experiencing. Some of the most common are:
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