The ASTM D6633-18 standard is used to evaluate the Basic Functional Stability of mechanical pump distributors under accelerated use conditions. This practice covers the accelerated use testing of pump distributors containing products to determine their Reliability and Stability in practical applications. This helps ensure stable performance of mechanical pump distributors during extended use or high Frequency operation. The standard does not address all safety issues. Users are required to comply with relevant safety and environment regulations and determine applicable regulations as needed.