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How to Correctly Diagnose Production Problems Before Taking Action Gas lock and fluid pound are two of the most common production problems in rod pump systems, yet they are frequently confused because both can reduce pumping efficiency and cause production decline. However, their root causes, operating characteristics, and corrective actions are completely different. Gas lock occurs when excessive free gas enters the pump barrel and interferes with valve operation, while fluid pound occurs when the pump attempts to lift more fluid than the reservoir can supply. Correctly identifying the difference is essential because applying the wrong solution can increase downtime, operating costs, and unnecessary workovers.