What drivers used to know - the signals from the fuel pump
05/21/2024
Many cars have a fuel pump, or several for redundancy reasons (e.g. in racing cars). While a Fiat 500 Topolino could still do without it because the tank was above the carburetor, most cars have to actively transport the fuel to the mixture preparation system. The fuel pump can be mounted at the front or rear. In certain cars, it is also noticeable due to its interesting noise development.
Some fuel pumps tick audibly. As soon as the ignition is switched on , as in the Jaguar S 3.8 shown here, it starts working and pumps fuel. If the frequency of the ticking noise drops significantly, you know that sufficient fuel pressure has now been built up.
In other vehicles, it is more of a humming noise, but also changes its frequency when there is enough fuel in the engine.
Typically, the starting procedure (ignition key one notch further or pressing the start button) is only completed when the background noise is correct.
Of course, modern drivers have long forgotten or never even known about such refinements. The modern car (naturally) regulates all this itself. But where is the romance in that?
