I have a Ef wagon when I try to start it on gas the motor will start but stops straight away on the secound try it starts fine It sounds like it is running out of gas and stopping the first start. When I have it switched to petrol its fine This problem has just started to happen Any advice from the forum will be appreciated.

Dude

most cars prime on petrol then switch to gas
when you start them
and wot you problem will be is that you need a bigger change
over time insted of maybe 4sec you mite need 6sec
it's the computer shuting off the petrol b4 the gas starts
so you will have to take it to a autogas shop and tell them
whats wrong with it and thay will fixx it
couldn't tell you how to fix it yourself as i don't know

I found with my EA that it struggled to start with a fuel start system. yet it started perfectly on LPG only. Seems instead of running petrol for a few seconds then switching over to LPG it was in fact duel-fueling

zendo how did you go????