Take a couple of bollockings already for criticising LPG while obviously preferring to use it instead of spending double on petrol and taking the trouble to fix it Mark
I could relieve you of all your troubles and sort all LPG problems on all your vehicles... if you brought them to me for repair... and then there'd be nothing to hate about LPG? If you were thinking of bringing your ST220, first I might advise fitting the proper Ford spec Motorcraft plugs, you might want to do that yourself before you came.
Every type of lube system puts fluid into the manifold, but does yours do it directly (as in lube pipe feeds straight into the manifold) or does lube pipe connect into gas pipe somewhere? A lot of BRC installs use BRC's lube system, which involves lube entering the manifold via LPG injectors, which is a big negative for LPG injectors and performance of the LPG system. BRC injectors aren't cheap, you don't want to ruin them by gumming them with lube fluid. After gumming it's not unusual for injectors to remain defective after any amount of flushing with cleaning fluids etc.
Two LPG tanks on my not very economical 3.3 Grand Voyager, can get 60L in the toroidal underslung tank and 80L in the luggage area cylinder tank (which I can easily remove, do so every time I take inlaws and co to the airport).. I filled from empty with 140 litres the other day and on a long motorway run that could get me 700 miles on LPG, saving me £80 in the process. Saves me £80 a fortnight in fuel costs anyway!
Full time LPG installer
Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
2 miles A1, 8 miles M62, http://www.Lpgc.co.uk