Backup or lack of it

What's happened to customer service these days reference my 'reving woes' thread, I have been able to confirm that the problem is in the lpg system somewhere, the lpg tank is empty and the system should recognise this and stay on petrol but it's not so the car stalls.
The installers 'Enpowerlpg' no longer exist so I called the Prins distributors in the UK to ask for advice and also one of their installers who both promised to phone back, (yeah we've all heard that one I guess) Thank god for forums like this because manufacturers these days are only interested in you before you buy