Excel Engineering has extensive experience performing cost effective permeation testing of gasoline fuel tanks. Excel is presently performing in-use testing directly for the US EPA. We perform the full durability and preconditioning series with UV exposure, slosh, and pressure cycling. Preconditioning is performed simultaneously with the durability series provide cost effective and rapid results to our customers. Our facilities are qualified for all the testing requirements for the EPA and CARB evaporative emissions certification.