[Diy_efi] LPG vapor injection with gasoline injectors: calculatingfuel requirements

[Andy Harvilla]

John,

I've been working on a similar project involving an internal
combustion engine powered by vaporous fuel, but I haven't progressed
much further than the theory and a few rough designs (been busy with
other things).  As you probably know, propane-powered vehicles have
been around for quite some time... however, all of the fuel metering
I've seen was done mechanically through a special carburetor.  Some
UPS trucks use liquefied natural gas (LNG), but I don't know if the
fuel system is computer-controlled or not (and neither does my UPS
delivery man!).

Do you have to run the fuel through the ECM?  It might be easier to
devise a simple vapor carburetor and use the computer for timing, etc.
-- that's my own route at this point.

Andy