Does an Engine Necessarily Require Fuel?

[CaydenDella]

To avoid increased fuel consumption and ensure normal engine startup and operation, it is essential to maintain the vehicle's fuel system. Reasons for Maintenance: After prolonged use, the fuel system can become obstructed or clogged due to dust in the air and impurities in the gasoline. Additionally, carbon deposits and gum produced during combustion can adhere to the intake and exhaust valves, intake and exhaust passages, throttle body, and combustion chamber, particularly on the fuel injector nozzles. This can lead to clogging or sticking of the injectors, causing fuel leakage, poor atomization, or even complete failure to inject fuel. Consequently, this results in increased fuel consumption, reduced engine power, unstable idling, poor acceleration, and difficulty starting. Maintenance Considerations: Regular fuel system maintenance is necessary—neither neglected nor overly frequent.

[Nascimento]

I've been driving trucks for twenty years, and engines don't necessarily have to burn fuel oil. Diesel and gasoline are just the most common options. For example, natural gas engines use CNG or LNG as fuel, which are particularly common in buses. Some construction vehicles burn liquefied petroleum gas, which is essentially the same gas found in gas cylinders. The most unique is the hydrogen fuel engine, which directly burns hydrogen and only emits water. You hardly see them on the road, but labs have developed quite a few. I've seen ethanol-modified cars in repair shops—they have a strong alcohol smell, and they're everywhere in Brazil. Nowadays, electric vehicles don't count as traditional engines, but broadly speaking, anything that burns can be called a fuel engine. Even vegetable oil can power a vehicle—it all depends on how the system is designed.

[MacGeorge]

Anyone in vehicle engineering knows that an engine is essentially an energy converter. The fuel system converts kinetic energy by burning petroleum fuels, but now even electric motors powered by electricity are considered engines in a broad sense. Take the hydrogen fuel cells used in port AGVs—they fundamentally generate electricity through electrochemical reactions. Even ammonia-fueled engines were successfully tested in Japan last year, achieving zero carbon emissions. I've worked on biodiesel projects that used waste cooking oil as fuel, making truck exhaust smell like french fries. However, switching to gas requires adding gas tanks, while electric vehicles need battery packs—the key is energy density and cost-effectiveness.

[MacBentley]

As an auto repair shop owner, I've dealt with all kinds of fuel issues. Gasoline engines account for 90%, but gas-powered vehicles are increasing. Taxis converted to natural gas save half the cost, though with slightly weaker power. Methanol fuel is quite common in Shanxi, requiring fuel injection system modifications. The most troublesome issue is owners using wrong fuel grades - putting 92-octane in a 95-octane car causes knocking. Hybrid owners often ask: Does the fuel used when the engine charges the battery count as fuel consumption? Essentially, it's still consuming fuel. To completely eliminate fuel consumption, you'd need pure electric vehicles, but charging station coverage remains insufficient. With thirty years in auto repair, the history of fuel evolution represents half of automotive development history.

[VonChristian]

From the perspective of a new energy researcher, fossil fuels are merely carriers of chemical energy. Hydrogen fuel cell vehicles generate electricity by converting the chemical energy of hydrogen into electrical energy. Ammonia-fueled engines use liquid ammonia cracking to produce hydrogen for combustion, a technology Japan has already implemented in cargo ships. Our lab recently tested synthetic fuels, creating gasoline substitutes by combining carbon dioxide with green hydrogen. Although it still burns liquid fuel, the carbon cycle is closed-loop. Solar-powered vehicles belong to direct photoelectric conversion and strictly speaking don't qualify as engines. From an energy evolution standpoint, the trend toward diversified engine fuels is quite evident.

[LeEmma]

I found that fuel offers a lot of room for experimentation in car modifications. For gasoline-powered cars, you can flash the ECU to improve combustion efficiency, while switching to ethanol fuel requires replacing the high-pressure fuel pump. A friend converted a diesel pickup to run on waste engine oil—just filter it and pour it straight into the tank. In Europe, some people extract biodiesel from coffee grounds, giving the car a latte-like aroma when driven. The coolest modification is the electric classic car conversion, where the engine of an old Beetle is replaced with an electric motor, preserving the mechanical feel while achieving zero emissions. At its core, fuel selection is about energy sources—petroleum isn’t the only solution. In the future, we might even see miniaturized applications of nuclear fuel cells.