On or around Wed, 22 Oct 2003 08:33:17 +0000 (UTC), "Olly R" enlightened us thusly:
>My V8 LPG can start on gas, but specially when the weather's cold it's
>easier to start on petrol, because the LPG system uses warmth from the
>coolant to vapourise the liquid gas, so first thing in the morning there
>isn't any heat to do that.
only if it's down about -37°C. At all normal UK temperatures the gas will vapourise. What can happen is that moisture in th air can freeze in the vapouriser causing it to jam, hence the heating using engine coolant - the process of evaporation of gas creates a lot of cold. It's also essential rather than just a good idea to run at least 25% antifreeze all year, as it's possible on cold mornings for the internal water passages in the vapouriser to freeze up before the coolant gets warm enough to prevent this, otherwise.
Any subsequant starts can be done effortlessly
>on LPG. I have a feeling that it has to be really quite wintry for it not
>to want to start in gas at all though (I managed it last January, it had sat
>outside for two weeks in the Glasgow frost and started first time, bless >it).
they all should do this. It's simply not true that you *have* to start on petrol - anyone that says you do or that the vehicle "won't" start from cold on gas is either misinformed or the system is out of kilter. In fact, I've tended to find that they start easier in the cold on gas - the gas doesn't condense out of the mixture in the manifold like petrol does
Mine runs gas-only and starts in pretty much any weather. However, on a dual-fuel system it's a very good idea to start it at least once a day (if used daily) on petrol to make sure the petrol system gets some exercise. When i was running the Sierra, which is dual fuel, I used to be in the habit of starting on petrol first thing every morning, and thereafter starting on gas.