To follow-up on an earlier post where I found raw gas leaking down the center venturi straight into the engine (type 4).
I had previously run the gas tank dry because the gauge said I still had 3/8 tank. Apparantly some time before that I got bad gas and some water accumulated in the bottom of the tank. Emptying the tank sucked the water right into the dual Webers. Short while later the crappy running and gas leaks started.
The Weber man (Tony Grasso, Strictly Carbs) disassembled, cleaned, and polished all parts. Now runs perfect. Man did the water ever do a number on the brass and the carb case itself (really hard water here in San Diego). Tony is now my Weber jeweler. Hopefully a bit of denatured alcohol into the gas tank has dispersed the water now.
So beware of running out of gas in areas where you have hard water. And beware of gas leaking undetected down the manifold, into an open intake valve, down the cylinder walls and diluting the oil in the crank case, all of which happened to me. My shake down run was up to Knott's and back. Ran like a champ. Enjoy the trip!.
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