A diurnal breathing loss test is defined in the Federal Register as 'fuel evaporative emissions as a result of the daily range in temperature to which the fuel system is exposed.' In the case of diurnal evaporative losses, this situation is simulated in the Federal Test Procedure by artificially heating the fuel tank (and indirectly the fuel itself) over a one hour period, such that the tank fuel undergoes a temperature excursion from 60 to 84F. The report researches what is presently known about these three aspects of fuel tank diurnal losses and compares them with the current test procedure. An evaluation of the important differences between a real-life diurnal and a simulated test procedure is made using data gathered from an instrumented fuel tank. This report primarily focuses on the mechanisms involved in the evolution of hydrocarbon vapors from a vehicle fuel tank.


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    Title :

    Typical Vehicle Diurnal


    Contributors:
    G. M. Wilson (author) / T. Rarick (author)

    Publication date :

    1976


    Size :

    61 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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