Cars generally use gasoline (aka "petrol") or diesel oil. However, some cars also run on compressed natural gas or liquid petroleum gas. Much of it depends on the car's purpose and the owner's goals.
If the engine is running it is using fuel.
Because it's attached to the engine and uses power when you turn it on. Even if it wasn't attached to the engine, anything in or on a car that takes power in some form will use fuel because ultimately it's the engine that supplies that power.
The combustion of gasoline or diesel fuel
That's an engine that burns gasoline, to produce motion. Many car engines use gasoline as fuel.
If fuel filter is plugged car will idle but starve for power as it is getting very little fuel, If fuel pump is bad car will wind over but not start " no fuel going to engine " A little trick I use pound on bottom of fuel tank while engine is turning over if engine starts then you know you have a bad fuel pump
Not at all. Instead, they are being used in car engines as an alternative fuel as it is a green fuel (non - pollutant). But, the drawback is that you may have to change / modify the engine of your car to use this type of green fuel.
The engine doesn't have to use as much fuel when the car is traveling downhill.
If you mean does the A/C cause the engine to use more fuel, the answer is yes and no. In city driving the A/C does indeed cause the engine to use more fuel. On the highway at speed, the engine uses about the same amount of fuel with the A/C on as with the A/C off and windows down. It also depends on the model year of the car. Older cars have A/C compressors that require more power to drive.
That depends on the model of car, some cars are front engined and some have the engine in the rear. The fuel filter can be placed anywhere between the fuel tank and the engine but it is usually in the engine compartment.
a car with a combustion engine
No, of course not. The fuel pump supplies fuel to the engine. The engine will not run without a supply of fuel.
There is no other way for the fuel to get into the engine.