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Hot Weather Fuel Requirements of 1975-1980 Model Year Cars
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English
Abstract
The response of late model year vehicles to front-end fuel volatility was measured in a consumer survey carried out in Houston, Texas in the summer of 1980. About one hundred ninety customers were given gasoline of varying front-end volatility on a weekly basis. Responses to these changes in volatility were measured by weekly telephone interviews with each customer. Results show that Volatility Class C of ASTM D 439 provides high temperature driveability protection at 96°F (35.6°C), its highest vapor lock protection temperature. Most of the time Class C is overprotective, however, because the protection temperature must drop below 85 °F (29.4 °C) before a more volatile fuel, Class D, is permitted. Problems observed by participants on highly volatile fuels were sluggish performance, occasional stalling, and poorer start-up when hot. There were no cases of “vapor lock” (disabling of the vehicle because of fuel pump starvation) during the survey.
Citation
Clarke, P., "Hot Weather Fuel Requirements of 1975-1980 Model Year Cars," SAE Technical Paper 811229, 1981, https://doi.org/10.4271/811229.Also In
References
- 1980 Annual Book of ASTM Standards, Part 23, Petroleum Products and Lubricants.
- “Evaluation Of A High Temperature Driveability Test Procedure—1971 Yuma Program” CRC Report No. 455, 1973.
- “Evaluation Of Expressions For Fuel Volatility” CRC Project No. CM-60-65, 1967.