Ok, took drain plug out of vaporizer and only a single drop of yellowish/clear fluid came out (at operating temp). Screen in fuel line at "carb" looks like new. Pulled the injector and everything was clean inside, o-oring was intact. I should have previously mentioned this unit only has 1800 hours on it and is extremely clean under the hood. Did some more troubleshooting though and found something interesting. I did check for spark before, and it appears to have it fine, bit that was with and old spark plug. Just checked it again with an actual spark tester, and it appears to have spark on the initial rotation but then immediately goes away. Sometimes it will spark o. The 2nd revolution, and the motor "tries" to start, and sometimes does, but no spark after that. However, give it a shot of ether and it will fire right up and stay sparking. I even tried putting the original crank sensor back in and it still does the same thing (the cam sensor was the one originally throwing the code but I replaced them both). I dunno what's going on here. What could cause it to lose spark after the first or second revolution?