Abstract: A system and method for recovering a gasoline vapor/air mixture from a vehicle tank during the dispensing of a gasoline from a storage tank into the vehicle tank, according to which a flow line is established for the flow of the mixture from the vehicle tank to the storage tank during the dispensing. A pump is activated during the dispensing to flow the mixture from the vehicle tank to the storage tank, and the mixture flow is terminated in response to the termination of the dispensing. The pump is then activated to pressurize the flow line after which any reduction in the pressure of the mixture in the flow line is sensed. According to another embodiment, the mixture flow is terminated in response to termination of the dispensing and ambient air is introduced into the flow line. The pump is activated to pump the ambient air at a desired flow rate, and the flow rate of the air through the flow line is sensed.

Abstract: A system and method for dispensing a fuel derived from one or more fuels having different octane ratings respectively stored in a plurality of storage tanks. The fuels are passed from their respective tanks to a mixing zone for mixing to form a blended fuel. The blended fuel is passed from the mixing zone to a dispensing nozzle while the octane rating of the blended fuel is sensed. The flow of each fuel from its tanks to the mixing zone is controlled accordingly to establish and maintain a predetermined octane rating of the blended fuel.

Abstract: A system and method for dispensing a fuel derived from one or more fuels having different octane ratings respectively stored in a plurality of storage tanks. The fuels are passed from their respective tanks to a mixing zone for mixing to form a blended fuel. The blended fuel is passed from the mixing zone to a dispensing nozzle while the octane rating of the blended fuel is sensed. The flow of each fuel from its tanks to the mixing zone is controlled accordingly to establish and maintain a predetermined octane rating of the blended fuel.