just read the post on engine preheaters and lpg(had both) deffo recommned engine preheater!!
Hmm got me thinking here,
I ran lpg for years on me 24v,s mostly ZAVOLI and etagas systems if i remember correctly ,(first one i cant rememeber but it was a mixer system not injection) they were not as advanced the the current ones but served me well enough even on the racetrack!! however all of the kits i had on my cars had the same hidden little trick for emergencies, if you switched the the lpg/petrol switch on and off 3 times the car would start on gas not petrol,it was recommended to just hold it on a steady throttle for a while to warm it up a bit but it worked(was very handy when the fuel pump for petrol died meant i could get to work all week until i could replace the pump at the weekend, instead of having to do it on the tuesday night!!
  anyone tried it on the current setups?

cant remember of the first postion was on petrol or gas so it may take couple of experiments to get it right way round!!
let me know

edit thinking about it it must end on gas!! so start the sequence on petrol postion!!

What is the procedure for starting on gas exactly?

Apparently my BRC Sequent 56 CANNOT be forced to start on LPG ...