APPARATUS FOR CONTROLLING GASOLINE VAPOR EMISSIONS
The present invention combines the gasoline vapor recovery efficiency advantages of a Hirt "Partial Seal System", as disclosed, for example, in U.S. Patent No. 4,680,004 to Hirt, with the customer convenience advantages of gasoline vapor recovery systems employing "bootless" nozzles. The use of bootless in combination with strict environmental vapor emissions compliance is made possible because of specific system advantages, which include the use of a burner (60) designed to operate at two different flow rates, a coaxial processor stack (66) which permits second and third stage combustion of excess gasoline vapor generated by the system before it is released to atmosphere, and a remote sensor (110-114) which continually monitors system vacuum pressure to ensure that a sufficient vacuum is maintained at all times. A major advantage of the present system is that the processor unit is adaptable for installation into existing gasoline vapor recovery systems and into other systems, including other manufacturer's systems.