Quote:
Originally Posted by Larry Brumfield
Marc, your problem may not have been vapor lock at all.
Is vapor lock a continuous thing even with a continuous, GRAVITY FED, fresh supply of cooler gas going in the carburetor from the tank? I don't think so. The carb and fuel line would have to be really hot for that to happen continuously especially while moving down the road.
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But on a gravity fed system vapor lock does not make much sense in my opinion. The fuel would really have to be heat sensitive even in CO. or higher altitude. ...
Larry B.
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Larry and Marc,
In case you guys missed the earlier extensive vapor lock thread, here is a link you might find of interest:
http://www.fordbarn.com/forum/showth...k+nonbelievers
While there may be some doubt whether vapor LOCK can occur in a continuous running gravity fed engine, there is no doubt that vapor FORMATION can occur. The earlier thread shows a bunch of pictures of it happening in the top of the sediment bowl with the car idling on a summer day with the hood open. Since the initial boiling point of gasoline is around 100F, some such behavior shouldn't be a surprise. Neither is it far fetched to worry that the process might get out of hand, occur further down in the fuel path (out of sight), and cause rough running or stalling under more extreme conditions. For example, I have observed one of those clear plastic fuel filters installed in the fuel line fill up with vapor and then stall the engine--repeatedly. On the other hand, the car in the pictures barely hiccuped when the vapor bubble would periodically burp on through the system.
What mystifies me is why this is such a problem for some and not for others.
Here's one of the pictures showing the vapor bubble whereof I speak.
Steve