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Abstract
Extended isothermal equilibration tests at 75°F (=24°C) and 94°F (=34°C) were conducted on a 1988 General Motors (GM) Corsica fuel system in a sealed housing for evaporative determination (SHED) using pure methanol fuel (M100). An initial condition of evaporation canister breakthrough loading was chosen to avoid hysteresis effects, and assure experimental repeatability. Hot Flame Ion Detection (HFID) analysis of air samples from the SHED were performed during 6‐hour experiments. The concentration of methanol was found to increase continually over the duration of the experiments, but at less than a linear rate. A temperature dependent model was developed assuming that evaporation rate is proportional to a finite mass of fuel available for evaporation and diffusion from the fuel system. This study suggests that the hot soak emissions process, with concurrent thermal and non‐equilibrated fuel system vapor concentration gradients, is unlikely to stabilize within a nominal one hour period.
Notes
On Assignment to the National Exposure Research Laboratory, U.S. Environmental Protection Agency