Manifolded fuel vapor

Claim 1

Method for providing a substantially constant degree of vacuum assist to a system which carries a volatile liquid, and having means within the system for dispensing said volatile liquid from a liquid holding reservoir to one or more of a plurality of receiving tanks, and for concurrently withdrawing vapors from said one or more receiving tanks being filled to avoid passage of said vapor into the atmosphere, which method includes the steps of; providing a closed, vapor circulating circuit having an inlet manifolded to the respective receiving tanks, and having an outlet communicated with said liquid holding reservoir, said vapor circulating circuit including a vapor inductor means therein, introducing vapors from said one or more receiving tanks into said vapor circulating circuit, the latter having a vapor circulating capacity which is substantially greater than the maximum flow of vapor which would be received from said receiving tanks when all of said tanks are being concurrently filled with said volatile liquid, whereby said inductor means will establish a vacuum condition at the said vapor circulating circuit inlet regardless of the number of receiving tanks being filled, continuously circulating said vapor through said vapor circulating circuit until the latter is circulating its maximum capacity of vapor, and thereafter as additional vapor is withdrawn from the respective receiving tanks being filled, passing said additional vapor from the vapor circulating circuit into said liquid holding reservoir.