A modern fuel dispenser is logically divided into two main parts — an electronic “head” containing an embedded computer to control the action of the pump, drive the pump’s displays, and communicate to an indoor sales system; and secondly, the mechanical section which in a ‘self contained’ unit has an electric motor, pumping unit, meters, pulsers and valves to physically pump and control the fuel flow.
FUEL NOZZLES :-
Nozzles are attached to the pump via flexible hoses, allowing them to be placed into the vehicle’s filling inlet. The hoses are robust to survive heavy wear and tear, including exposure to weather and being driven over, and are often attached using heavy spring or coil arrangements to provide additional strength. A breakaway valve is also fitted to the hose to allow the nozzle and hose to break off and fuel flow to be stopped in the case a vehicle drives off with the nozzle still in the filler.
In some countries, pumps are able to mix two fuel products together before dispensing; this is referred to as blending or mixing. Typical usages are in a “mix” pump to add oil to petrol for two stroke motor-cycle to produce an intermediate octane rating from separate high and low octane fuels, . The benefit of blending for retailers is that it allows them to offer 3 grades of fuel while only having to maintain inventory of two grades. This frees up both working capital and tank capacity and improves fuel turnover.