SAE J2973

Description / Abstract: This SAE recommended practice specifies a standard geometry leak channel to set the leak threshold and compare results from a variety of leak test technologies and test conditions. This practice applies to fuel system assemblies and components which have a risk of allowing regulated fuel or fuel vapors to continuously escape to atmosphere. A component or assembly tested to this standard has a zero HC leakage threshold because the selected leak channel (Equivalent Channel) will self-plug and will not emit measurable hydrocarbon liquid or vapors. Therefore this standard eliminates leaks as a source of evaporative emission. This practice was primarily developed for pressurized and nonpressurized fuel systems and components containing liquid hydrocarbon based fuels.

Purpose 1.1.1 Provide generic leak tightness specifications based on an Equivalent Channel (or maximum allowed microchannel type of defect).

Define specific Equivalent Channel sizes for fuel line assemblies, vapor management components and fuel tank assemblies that will result in no hydrocarbon SHED detectable emission due to leaks..

Specify leak Test Method's Requirements and Practices to set up and qualify a leak test methods and compare dissimilar test conditions.

NOTE: It should be noted that fuel components and systems normally exposed to fuel fluids (liquid and vapor) are tested to meet HC emission requirements with test methods utilizing compressible, non-hazardous gases such as air, nitrogen, and helium.