Agility Fuel Systems (Agility) is recalling certain compressed natural gas (CNG) fuel systems, part numbers 22989600, 24990722, 24989800,23708001, 23710031, 25600000, 25799500, 22999800, 22989700, 24990601, 25789600, 25789800, 22999500, 22999700, 25799700, 25799800, 25729800, 22929500, 22922500, 25769500, 25769700, 25799500, 22969500, 22969600, 22969700, 22969800, 22999600, 24269800, 24960800, 25789700, 25799600, 23914000, 25640000, 25653000, 23913000, 23910000, 23903000, manufactured August 1, 2014, to June 1, 2015. The affected systems are equipped with pressure relief devices (PRDs) that may not function as designed and vent a buildup of pressure, such as could occur if the compressed natural gas (CNG) tank was exposed to fire.