Patent ID: 8770237

Claim:
A system for controlling a vapor recovery system that recovers vapors expelled from a vehicle during refueling at a fuel dispensing point and returns the vapors to an underground storage tank in a service station environment, comprising: an air to liquid regulator valve associated with the fuel dispensing point, the air to liquid regulator valve being configured to regulate an amount of vapor that is recovered through the fuel dispensing point for a given amount of fuel that is dispensed through the fuel dispensing point; a vapor pump that is in fluid communication with the air to liquid regulator valve, the vapor pump having an inlet side and an outlet side; a vapor flow path that is in fluid communication with the air to liquid regulator valve and the vapor pump; and a controller operatively connected to the vapor recovery system adapted to: monitor a parameter of the vapor recovery system; and maintain a substantially constant pressure level in a first portion of the vapor flow path that is disposed between the inlet side of the vapor pump and the air to liquid regulator valve.