I have an old hyster h50h, it has the ford 192 in it. I believe that it was originally a gas truck, but was later converted to lpg. the problem is that the truck has no power in gear, can hardly go up a small incline. I originally thought it was a transmission issue but i believe that its actually a fuel problem. it will only rev in neutral and only with the pedal barley pushed. The truck has a century converter, it was taken apart cleaned and appears to be working. From the converter a line runs to a marvel schebler carb, that i can find absolutely no information on, that has a little nozzle on it. This nozzle has a rod connecting it to the butterfly on the carb, hitting the throttle opens a port and propane enters the carb. I also have a brass coupler in my air inlet system that has a 7/16 **** on it. Nothing runs to this although i was told that this could be a mixer. It has "Beam" cast into it. What i do not understand is how the system delivers the correct amount of propane based on engine condition. I would think that there would be some sort of vacuum controlled metering system but cannot find one. I also have a governor at the base of the carb that is completely shot, no arm connecting it to the butterfly and the diaphragm is no longer working as it wont hold any vacuum. Do i need a governor? I am a car mechanic so i have some ability but i am either over complicating this or missing something. My system looks cobbled together. Is buying an Impco system the way to go? Can i use my regulator/vaporizer with any lpg carb rated for my engine horsepower? I have photos i just see how i add them to this post.