A: http://www.biphase.com was the url of the company by that name. They resolved the vapor lock issue with an AC charge kept back to cool the injectors after shutdown. The system was set up for many fleet vehicles and it runs quite well (I currently have the manuals for several of the GM and Ford truck systems and had planned to train and get my installation license a few years back) The return wouldn't ok because then the stability of the whole tank would be compromised by the wamred fuel, From: adh@xxxxxxxxxxxxxxxxx (Sandwich Maker) To: mail@xxxxxxxxxxxx Subject: Re: LPG / LNG Injection > the Future Fuel " From: "Brien Tourville" <hh7x@xxxxxxxxxxx> " " " http://www.gas-injection.com.au/index.html jim blair located a company a few years ago, that was developing liquid-lpg injectors. iirc they were working under some kind of grant or funding and targeting the ford 460; they didn't have any smaller injectors that we might use on a 4.0. also iirc their biggest problem was icing on the injectors from the fuel vaporizing. surprisingly i don't recall anything about vapor lock, but if they retained a fuel pump and pressure regulator return line, vapor would be purged almost as easily as with gasoline. ps. got a url for sleeger? do they have anything for the xj? or don't they sell retail? ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought