Fuel Filter - Initial Single-Pass Efficiency Test Method
This SAE Standard is intended for all sizes of fuel filters, so a variety of test stands may be required depending upon flow rate. The low contamination level, downstream clean-up filter, and short duration of the test ensure that the particle retention ability of the filter is measured in a single pass, as no appreciable loading or regression will occur.
The previous method required gravimetric measurements of the injection system’s contamination level to be used as one criteria for acceptance of a performed test. A replacement acceptance criteria has been added that is based on the upstream particle counts that correspond to the expected counts at the original required contamination gravimetric level. The distribution of upstream particle counts provides more detail of the contaminant challenging the test filter than a gravimetric value and can be used to assess the stability of the filter’s upstream challenge. Further, gravimetric results can have a large variation at low contaminant concentrations. The revised standard provides a range and standard deviation of acceptable upstream particle counts for the sizes analyzed which are used to assess the acceptance of a completed test.
Also known as: SAE J 1985
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