WEATHER OR LOCK VAPOR LOCK STUDY, ROAD AND LABORATORY

Vapor lock in automobile fuel systems has been shown by others to relate to Reid vapor pressure and the shape of ASTM distillation curve. This test program was designed to confirm established relationships, to determine repeatability of a standard road test technique, and the reproducibility of the road results in a chassis dynamometer hot room.

Known relationships of vapor lock, RVP, and ASTM distillation were essentially confirmed. Moreover, it was found that, within the test technique, the data had a high degree of repeatability and the chassis dynamometer duplicated the road results within the statistical error of the test.