Your question makes no sense, natural gas IS a "fuel".
It can be used for a fuel and it is also used as a carrier gas for gas chromatography
Yes.
no
A fuel is any substance used as a potential energy source. It could be a solid, liquid, or gas.
A gas pump is used to move the fuel from the gas tank into the engine. Every gas station, from Esso, Shell, Petro Canada to Ultramar have something like this.
Propane
The fuel used in bulldozers is diesel.
no
It is used as a fuel.
Hydrogen gas
Propane gas is a fuel that is used in many different ways. The most recognized use for propane is for gas barbecues. It can also used to heat homes, fuel cars, appliances, fireplaces.