The burnt fuel creates pressure in the cylinder above the piston and forces it downward.

But officials said the chemicals and fuel created a pollution hazard.

But engineers are finding that the alternative fuel potentially creates as many problems as it solves.

Heavy trucks are allowed in only at night but their diesel fuels create much of the problem.

The leaking fuel from the wing briefly created a fireball that engulfed the airplane.

Rich mixtures are bad because the unburned fuel creates pollution.

Officials were trying to determine whether the spilled fuel created an environmental hazard and to decide on the best way to remove it.

The Adminstration says the alternative fuels create less pollution than gasoline.

Fossil fuels create centralised, hierarchic and inflexible energy distribution.

The nuclear fuel in the reactor creates the heat through nuclear fission.