Hi Ruby,
if you search through the LPg section you will see post from Aus (volvovic I think) with a 740 LPG conversion. The installers have struggled to convert the car mainly due to lack of experiance and knowledge.
I have converted many 240's and they do not give me any trouble because I know how to do it. I asume you have K jetronic mechanical injection at that age. If so it use simple to do but must be installed correctly or you will have problems. The 4 cylinder engines fitted 240 all have hard valves and seats and need no mods to run on LPG. I have a 240 hear now on 400,000 miles and was converted at 200,000 miles still on the original engine.
I'd be happy to talk to your installers and explain the exact fromula needed for making it work.
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