Quote:
Originally Posted by DannoXYZ
i wouldn't do that if he's finding gas in petcock's vacuum line.
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You're right, if there's gasoline in the vacuum line it would be obvious you shouldn't suck on it, and that the diaphragm is ruptured.
If there's no gasoline in the line, or for a bench test, I check them by sucking on the hose and then blocking the end with my tongue. After waiting 5 or 10 seconds, if it's still stuck to my tongue, it's good.
The operation of the valve, can be done by mouth with the petcock in place and gasoline in the tank.