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I think the best way to test fuel vapor is just to go straight to propane. You know it is 100% vaporized. There no possibility of any less than that at room temperature at 1 atmosphere of pressure. Unlike gasoline you can accurately meter propane into the engine.
Most fuel vapor setups just hap hazardly vaporize the gasoline at what ever unpredictable rate according to temperature, atmospheric pressure and volatility of the gasoline being used. Where propane flashes to vapor immediately upon depressurization.
Also a good portion of the chemicals in gasoline do not evaporate.
Now propane may seem like a dangerous on road motor fuel but when done correctly its much more commonly found as a motor fuel out side of the U.S. in south America and Europe. It doesn't seem to be any more dangerous than gasoline when used correctly.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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