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You're keepin me up at night now. I really don't know what this is. But I still think you've got to rule out once and for all any possibility of mixed up hoses. I say this because, again, I had a perfectly working system, did some work, head gasket or something, mixed em up and had gas pouring out of it. I drained it, blew low pressure air thru it for awhile, and it's been fine ever since, 210,00 miles. Whether my valves are good or bad, who knows? Who cares? Remember, we're supposed to only be talking "VAPOR" here. This is mostly an air quality emissions issue. Find another rig like yours, compare, get a better book,with good emissions system pictures ( Haynes manuals are a good cheap choice that I feel are better than the Chiltons), whatever, just rule that out. And. just for grins, loosen or remove your gas cap for a short drive, and see if that makes any difference. It's just a feeling, but if you're building really high vacumn in your tank, it could be doing something weird there. If this helps, try replacing your gas cap. Some of my best fixes, I've never understood all that well...
Head gasket problems? if it isn't obvious yet, it soon will be. In my experience, you'll start getting a coolant leak down the driver side of the block, as the gasket is pretty narrow right there in the middle. Pretty quick, you'll get a heavy, lingering, sweet smelling white exhaust "smoke", especially when you start up. The pressure in the system is seeping coolant into a cylinder after you shut down, and it burns off when you start up again. Number 2 cylinder is where I always have problems. This is not absolute, just my experience. Overheating, coolant loss, etc, in other words, not real subtle. Heading off to the north edge of Alaska for a couple months for work, so this is last post for awhile. Good luck.
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