How does a fuel dispenser work?

Fuel dispensers rely upon the simultaneous use of an electronic reading system and physical mechanical system to deliver a consistent flow of fuel, typically to a delivery nozzle. Whilst the electronic system is typically responsible for flow regulation (governing fuel pressure and volume), the mechanical components of a fuel dispenser uses pumps and valves, alongside an electric motor, to deliver the fuel.

Often, fuel dispensers will dispense using suction, creating a lower pressure within the fuel tank, and higher pressure outside, leading fuel up the delivery hoses towards the nozzle, at which point it is delivered.