I installed an LPG kit in a citroen AX (well I actually took a lot of the
components
from my previous car which expired). The citroen has a carb and I have tuned
the vapouriser and flow value with an exhaust gas analyser.

The car starts and runs fine from warm. I notice the engine needs a few more
revolutions to start than petrol. However from cold the engine shows no
willingness
to start on lpg. I have increased the time that lpg is supplied to the
engine when starting
and this allows it to burst into life a little then it dies.

Since the car has a mechanical petrol fuel pump it can take a long time
cranking
to get it to fire if I forget to switch back to petrol before the last run
of the day.

Any advice here or should I just stick to finishing on petrol for the night?