The Federal Motor Carrier Safety Administration (FMCSA) is issuing this safety advisory to provide notice to owners, operators and Registered Inspectors of Cargo Tank Motor Vehicles (CTMVs) concerning the limitations on the EPA Method 27 Test when used in lieu of the Leakage Test on DOT Specification CTMVs.  The EPA Method 27 Test may be used only on CTMVs with vapor recovery equipment and in dedicated petroleum distillate service.