P38 LPG issue - not enough fuel?

Hi all - I run a 4.6 RR with an LPG conversion, which has been working fine up until the last couple of days. Filled up with LPG last Wednesday, and by Friday I was noticing a lack of throttle response when running on gas, but thought it could be my imagination. On Saturday, I noticed that when I switched to LPG (sometimes it auto cuts in too early, and the engine isn't warm enough), the revs died right off, and the autobox seemed to not be able to make it's mind up what gear to use. Car felt almost juddery. Switch back to petrol, and normality resumed and everything was fine. Used the car on Sunday, and this time it didn't even bother to try and autoswitch to LPG, like it knew it wouldn't work if it tried! So anyway, I tried, and the engine response was completely flat with virtually no acceleration. I getthe feeling that the LPG isn't actually getting to the engine. Any ideas? Software or hardware issue? Stako tank, but can't remember what the system is. Thanks!

Could be anything from a blocked filter to a none working solenoid, you might be better posting this on an LPG forum or taking the car to an LPG fitter.
Have you checked the fuses for the LPG system they will be under the bonnet there should be 2.

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Jim

Thanks for the reply Jim - I'll try all those things!