Final answer:
The auxiliary fuel system involves interconnected tanks storing and delivering fuel for engine combustion. In space shuttles, it used liquid hydrogen and oxygen, while in cars, voltmeters indicate gasoline levels. Alternative fuel vehicles, like those running on ethanol, may have modified systems.
Step-by-step explanation:
The auxiliary fuel system is a crucial component in various types of engines, from those used in space shuttles to commercial vehicles like cars. It involves interconnected tanks that store fuel and ensure its delivery to the engine for combustion. For example, the space shuttle's main engines used liquid hydrogen and liquid oxygen held in separate compartments of a large tank, while car fuel gauges utilize voltmeters connected to sender units to indicate the level of gasoline in the tank. Furthermore, alternative fuel vehicles may run on different types of fuel, such as ethanol, which requires a modified fuel system. The functioning of these fuel systems is fundamental to the engine's overall performance and efficiency.