LPG, which stands for Liquefied Petroleum Gas, is a convenient energy source used for many purposes, including heating, cooking, as well as vehicle fuel. An LPG conversion is taking a normal petrol-powered vehicle and adding a secondary LPG vehicle fuel system. These dual-fuel LPG systems allow an LPG vehicle to operate on either LPG or petrol. The petrol tank remains in the LPG vehicle. The driver can switch from gas to petrol or vice-versa.
A CNG conversion kit alters a vehicle with a conventional gasoline or diesel internal combustion engine to run on compressed natural gas. A less expensive and more environmentally clean alternative to traditional gasoline and diesel. Vehicles may be modified to run manually exclusively on CNG or they may automatically switch back and forth between CNG and gasoline or diesel. Bi-fuel vehicles incorporate two separate fuel tanks, one for gasoline or diesel fuel and another for CNG. Their engines may utilize either of these fuel types at one time.