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.


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    Title :

    Hot Weather Fuel Requirements of 1975-1980 Model Year Cars


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1981 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1981



    Publication date :

    1981-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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