So, Brimmed it Tuesday, not quiet there, Full Tank still gives Intermittent switch over, however having done about 50 miles next day, it started to run full time on Gas. did another Coolant Flush as still brown crap in there, seems that all this flushing and Kevins Hose block has unblocked a load of crap some where.
Another Flush yesterday, and Brimmed it again last night, so far so good, seems to be running on LPG full time now, and it was bloodly freezing last so night fingers crossed, will keep flushing till clear.
Now, one thing Ive noticed with a full tank of LPG, when parked up after driving I can hear something in the LPG Tank, best description is like a Pendulum slowly swinging and then sounds like its tapping the tank on a swing, and it squeaks, bit like a rusty barn door, will eventually slow down and stop after a few mins. Whats that?, Float Level Chamber or similar?, I though the Level thing was done on Pressure?. Anyway maybe a Red Herring.