Autogas is the term generally used for Liquefied Petroleum Gas (LPG), when it is used for the  propulsion of road vehicles. It is obtained as a by-product of the distillation of oil from crude oil.  When it is pressurised it becomes a liquid and it is in this form that it is pumped into your tank.

It is often used as a bottled gas for cooking and heating where there is no natural gas pipeline nearby. LPG vehicles can be set up to run either as 'Dedicated' vehicles which have LPG as their  only fuel and are spark ignited - like petrol or 'Bi-fuel' (sometimes known as 'dual-fuel') vehicles.  These are vehicles with petrol engines converted so that they can operate on LPG or petrol; the  change from one fuel to the other taking place at the flick of a switch.

The conversion of a petrol engine, having spark ignition, is relatively simple and low cost. The  conversion of a diesel engine requires more fundamental and expensive modifications to the  engine.

 In all cases, gas is stored on the vehicle in special fuel tanks manufactured to stringent Indian and Asian standards. The safety of these tanks is much higher than your existing petrol tank.  The fuel is then fed to the engine and introduced into the engine intake tract, controlled by a  regulator.
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