The evaporative emissions system includes the filler neck and cap, tank, hoses to and from the charcoal cannister and valves like the vent valve. Small leaks are very small, around .020 in diameter. You can't see them. This is why we "smoke test" the systems to find them. It's a liquid smoke machine that pushes a slightly pressurized smoke into the evaporative system with common outlets blocked off, like the intake. That is your best bet in doing the repair, otherwise you can guess and replace parts because you would likely never see the problem. A common GM problem area is the vent valve, but common doesn't mean it is. Hope this helps. Gerard
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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