Patent ID: 6901786

Claim:
A leak detection system for a fuel dispensing vapor recovery system that recovers vapors during refueling of a vehicle and returns the vapors to a storage tank, comprising: at least one fuel dispensing point that delivers fuel from the storage tank to the vehicle and returns recovered vapors expelled from the vehicle into a vapor return passage that is coupled to a vapor return pipe arid wherein said vapor return pipe is coupled to the storage tank; an air-flow sensor operatively connected to said vapor return passage to measure the amount of vapor or air flow being returned to said vapor return passage and said vapor return pipe from said at least one fuel dispensing point; and a control system that is electronically coupled to said air-flow sensor to receive information about vapor or air flow detected by said air-flow sensors, wherein said control system without actively recovering vapor or air: determines if said at least one fuel dispensing point is idle, and if said at least one fuel dispensing point is idle: determines if said air-flow sensor registers vapor air-flow; and detects a leak condition in said at least one fuel dispensing point if said air-flow sensor registers vapor or air flow.