What it means is why are the ef dual fuel models harder to start on lpg even though they have the petrol start to run petrol through for a few seconds while gas is getting through then switch over to gas

Understand that, but what is it like when you start and run on petrol (No LPG)?

Seems ok but will check again over a couple days

If the petrol is ok in end and it is still taking longer to start on lpg wen though there's a petrol start assist could it be the petrol start box or just not be set long enough for the petrol or the fuel pressure regulator

Disconnected the vac hose on the fuel reg and think it was easier to start on lpg don't know and idle did change so pressure must have increased and the reg must be working