Posted by Steve@Advance on December 31, 2019 at 17:48:48 from (66.169.147.211):
Back before Christmas I posted about my propane powered Mitsubishi lift truck smoking and running rich.
This is an Impco system, Type J vaporizer, RK lockout valve, factory installed on an FGC 20 truck.
Well, I went through the fuel system. Put repair kits in both the vaporizer and the lockout valve, took the "carburetor" apart, cleaned it up.
Everything looked good, the vaporizer was filthy, but cleaned up well. Nothing difficult or questionable about any of it, I feel good about how it's starting, running, no leaks.
But it still seems rich. Blows blue smoke, some at idle, bad under load. It has a strange smell, not antifreeze, not exactly an oil smell. It never ever needs oil, not fouling plugs, not overheating or loosing coolant.
There is a high speed mixture adjustment, very difficult to access, but I have turned it to lean and it seems to have no effect, even loading the engine with the hydraulic pump, it makes no difference. I don't have a combustion analyzer.
Any ideas? Does rich running propane appear as blue smoke?
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