BYD F3/F3R Owner's Manual page 92

（1）Starting CNG vehicle
To protect the reductor and make sure that gasoline system is under normal state
position of conversion switch．If the gasoline system appears malfunction, engine can not use gasoline to work, to make the engine using
natural gas to work on, so the natural system sets the function of using natural gas to start directly.
a. Using natural gas to start
Shift the fuel conversion switch to "G" position, then check whether the gas gauge switch is indicating. Shift ignition key to "ON" gear, controller is
starting, at the moment gasoline working indicator is lighting, while natural gas working indicator is twinkling; shift conversion switch from "G"
position to gasoline position, then return to "G" position, at the moment natural gas and gasoline working indicator light are both lighting; then start
the engine, engine is using natural gas to start and work.
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F3/F3R OWNER'S MANUAL
The vehicle is using gasoline to start regardness of the