Vapor recovery line diagnostics

摘要

A vapor recovery line monitor, a fuel dispenser, and fuel dispensing system are provided. In accordance with one embodiment of the present invention, a vapor recovery line monitor is provided comprising a fuel dispensing and vapor recovery hose, a pressure sensing passage, and a pressure transducer. The fuel dispensing and vapor recovery hose defines a fuel dispensing passage and a vapor recovery passage. The pressure sensing passage defines a pressure sensing orifice. The pressure sensing orifice is positioned within the vapor recovery passage. The pressure transducer is coupled to the pressure sensing passage and is configured to provide an indication of pressure at the pressure sensing orifice. Pressure data may be processed and compared to predetermined thresholds to trigger a vapor return line blockage signal. A controller may also be configured to shut down all or part of the system when a blockage signal is generated. Signals from the pressure transducer or the controller to which it is coupled may be transmitted to a central location by means of a wireless link.