The system was running right after the engine rebuild and gradually got worse, the tank sender and valve has been changed, the injectors have been stripped cleaned and checked, filters and under bonnet pipework changed,all wiring double checked, and the vapouriser has been stripped and was extremely clean. I have also removed the inlet manifold and replaced the gaskets and seals.
Anyway its got to the stage where i need to spend quite a bit on it again without the lpg so its got to go around the summer, i would definately have an lpg car again (this is my second the first was a 3.9 classic) so maybe a mk 3
All the best
Mark