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On 16 Apr 99, at 17:24, James MacNaughton wrote: > It has been my experience, hoo boy, that vapour lock is a load of > codswallop. It is a fictitious condition dreamed up by incompetent > mechanics at the dawn of t~‹, otive era as a placebo for a condition > they couldn't explain. Quite possibly. > Vapour lock; the condition when the fuel spuriously gets so hot that it > vapourises, either in the fuel line, or the float bowls themselves. The > theory works, but I have sincere doubts that gas that had vapourised > wouldn't go ka-blooey anyway. The theory is that when you are relying on the pump to SUCK the gas from the tank that you can only such so hard before the gas vaporizeds and you are sucking vapor. Now suddenly the only thing coming out of the pump is vapor and this doesn't sit nicely in the carb float bowl anymore. Of course it would burn, but whatever gets sucked in is so little gas that it actually is much too lean to burn. It's just 1cc of gas vapor per liter of air compared to 1cc of liquid gasoline.... In the case of the type 3, I understand that the gas tank is high enough that the carbs will actually fill from gravity feed if the tank is more than 1/2 full. In this case I think I would check to make sure that the filter screen in the bottom of the tank is not clogged. If it were, it could promote vapor lock, but only cleaning the screen would cure it. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe