OldSchool1 said:
Did you explain how this works?
Might be something that we could do to?
It's quite common in some European countries although not that common in Britain yet. It's very popular in Sweden with American car owners.
Your best bet is to try an internet search for LPG.
However, In a (big) nutshell:
LPG stands for Liquid Petroleum Gas and is also known as Autogas. It is a blend of Propane and Butane gases. The blend varies from supplier to supplier. It is exactly the same as the bottled 'camping' gas for motorhomes/campers etc. The main supplier of which in the UK is Calor. UK Autogas is this same gas but with Fuel tax added on by our government.
When stored under pressure in the tank (mine's in the trunk) the 'gas' is actually a liquid. It's piped up to a device under the hood called a vapouriser. This lets some of the liquid out into a hose, releasing the pressure, whereupon the liquid fuel instantly turns back to a gas. This hose, containing the gas, is fed to another device called a mixer. The mixer can be attached to a carburettor or, as in the Mark VII, be installed in the air hose just ahead of the throttle body. The gas is allowed out of the mixer under atmospheric pressure only where it is sucked into the engine along with the air.
If you take a look at my gallery, in the engine shot you can see the rubber gas hose leading to a brass elbow in the air intake pipe. This in turn is connected to the mixer inside.
A device 'fools' the engine management into thinking that the injectors are working, thus allowing the ignition system to function.
More modern systems now use another set of gas injectors drilled & tapped into the inlet manifold in the same manner as the (petrol) injectors. With a dedicated management system. These are much more efficient.
It's actually all very simple, and very safe.
If I can answer any more questions then just fire away!