Though Nozzles, even in the senescent, are capable of dispensing two kinds of fluids, Gasoline and Diesel Fuel, our remarks will be confined to the dispensation of Gasoline.
Over decades, the hydraulic force involved in the dispensation of Gasoline tends to diminish. Where once there was fire-hose pressure allowing the flow of Gasoline to fill a tank quickly, there is now a variable somewhat dependent on the Gasoline supply but never of the power of yore. At its worst performance the Nozzle yields its fill with great reluctance, sometimes requiring up to a minute or so even to begin. At the same time, the configuration of the nozzle tip has been altered through extended use and misuse to preclude an even, laminar flow. Indeed, the turbidity of the escaping Gasoline often results in what can only be described as semi-spray. This often results in the dispensing area, if not the Owner himself, smelling faintly, or not so faintly, of Gasoline.
Prevention of this nonhygienic outcome may be achieved in several ways. A funnel may be employed; the Nozzle may be brought closer to the tank via leaning or squatting; or the Owner may dispense his Gasoline in the back yard, if he has one.
The topic of Leakage, while of paramount importance, is beyond the scope of this discussion.