hi guys
i have a el falcon with tickford gas i replaced the low series BEM recently witha low series bem out of another el falcon
before i changed it the car used to start on petrol then go to gas (about 3 second delay) now it starts on gas only and runs like a heap of s#@t on petrol are the tickford bem,s different

The BEM has nothing to do with the LPG. Most likely that a connection has be disturbed to the AMS controller that is in that general area.