| Description and Operation This bi-fuel vehicle runs on either petrol or liquefied petroleum gas (LPG). The LPG must be manually selected and operates by injecting LPG in liquid form through a supply manifold into the engine intake manifold. While LPG fuelling is in use the petrol system is disabled. LPG Leak Test There are two methods that are used to identify leaks in the fuel system: - the electrical leak detector
- the liquid leak detector
Electronic Leak Detector This type of equipment is very sensitive to the presence of any hydrocarbons, which may give misleading results. If the electronic leak detector indicates a leak, verify the results with a liquid leak detector. Liquid Leak Detector After applying the liquid to the LPG system, the suspected area must be watched very closely. If bubbles begin to expand from an area, a leak has been detected. | 
