An internal combustion engine burns fuel inside.
LPG or Liquid Petroleum Gas is a fuel, not a car. Pretty much ANY motor vehicle that is powered by an engine that burns fuel can be powered by LPG.
fuel
The fuel pump on a 1995 Jeep is in the fuel tank.
Oil is mixed with Petrol in what is known as a 2 cycle engine. This type of engine has no lubrication built in (as say an oil tank on a 4 cycle engine) so as the fuel/oil mixture burns lubrication is provided to the cylinder.
Naturalgas
coal
jet fuel
Depends on the type of engine
This actually depends on the type of fuel, but often, water vapor, pollutants and energy.
coal
fuel leak on top of what type of engine, gas or diesel?
A rocket motor (rocket engine) does not need air from the atmosphere. It carries the oxidant (source of oxygen) as well as the fuel.