This document specifies the terms and definitions, models and basic parameters, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage and quality commitments of small gasoline engine direct-coupled self-priming pumps. This document applies to direct-coupled centrifugal self-priming pumps (hereinafter referred to as self-priming pumps) powered by gasoline engines with a calibrated power of no more than 5.5 kW.