Gas providers are companies that supply fuel to consumers. The two most common solutions for the term 'Gas Provider' in a crossword puzzle are 'PUMP' and 'CITGO'. PUMP is a four letter word and CITGO is a five letter word. PUMP is a generic term for a device used to transfer liquids, gases, or slurries from one place to another. CITGO is an American oil company based in Houston, Texas, and is owned by the Venezuelan state-owned oil company PDVSA.