Evaporative System Integrity Test Standards

Section 240 Section 240.172  Evaporative System Integrity Test Standards Vehicles subject to evaporative system integrity testing shall fail the evaporative system integrity test if one of the following occurs: a)         Fuel Cap Pressure Decay Standards – While tested using the fuel cap pressure decay tester, the pressure decays by 6 inches of water or more during a 10 second period after being pressurized to 28 ±1 inches of water column; b)         Fuel Cap Leak Flow Test Standards – While tested using the fuel cap leak flow tester, the fuel cap leak flow rate exceeds 60 cc/min at a pressure of 30 ±1 inches of water column.  Determination will be made by comparing the fuel cap's measured leak flow rate with the flow rate obtained from a calibrated master orifice with a National Institute of Standards and Technology traceable flow rate which will result in a pass/fail flow rate threshold of 60 cc/min of air at 30 ±1 inches of water column; c)         Visual Functional Test Standards – While tested using the visual functional test, an inspection of the fuel cap reveals one or more of the following: 1)         a missing fuel cap; 2)         a missing or damaged o-ring, gasket, or seal; 3)         missing or damaged threads, flanges, prongs, or other parts used to secure the fuel cap to the fuel tank filler neck; and/or 4)         cracks, holes, or other visible forms of tampering or damage.