Fully automated gas chromatographic analysis of multiple Fischer Assay retort gas samples has been achieved. The system used includes a commercially available microprocessor-controlled gas chromatograph fitted with an in-house-designed and constructed automated gas sampling rack. This system allows unattended duplicate analysis of four samples and one standard; the total output of analyses per day is twice that using manual operation. Automation of the rack is achieved through microprocessor control of four time-programmable contact closures which operate a set of valves and a printer for sampling, regulating, and recording manifold pressure. Accuracies and precisions using the gas chromatograph sampling rack automatically are comparable to those achieved during manual operation.