Don't know exactly how it would work with a carburator car. In a fuel
injected car the LPG is fed through a valve into the air intake, between the
air filter and the throttle valve. There is an ECU that controls the gas
flow, and a switch in the cabin that turns the gas flow on and
simultaneously the petrol flow off. I guess in a carb car it would work the
same way, the switch would have to cut off the fuel supply, ideally between
the float bowl and the jet as simply stopping the fuel supply into the float
bowl may give wierd behaviour once the gas was flowing but petrol was still
being drawn out of the float bowl. Carb cars also don't as standard have
the electronic systems that feed info to the ECU (lambda sensor, crank speed
sensor etc.).
In addition, of course, there is the LPG tank itself, and a special filler
nozzle for it, and pipework to connect all the bits together.
Richard & Sammy ('73 Black Tulip BGT)
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