The answer is that they don't, Ernest.  A carb system is just a susceptible
(if not more so) to troubles caused by excessive heat as fuel injected
systems.  If you ever get the carb hot enough to start boiling the fuel in
the bowl you are in for a very interesting experience.  I suspect  that
perhaps the fuel vaporizing in the throat of the carb may draw a
considerably amount of heat from the carb keeping it cooler than you might
expect.  But, there has been more than one  carburated aircraft engine
stopping due to excessive heat in the fuel system.  You have to take prudent
measure to shield your fuel system from excessive heat regardless of whether
Carb or injected.

Ed A


----- Original Message -----
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, March 16, 2005 10:16 PM
Subject: [FlyRotary] Returnless fuel systems


> I'm not trying to beat this horse to death, but this question has been
> irritating me.
>
> We spent a lot of time discussing how the fuel that is firewall forward
> gets hot and boils, therefore, the fuel had to be routed someplace where
> it could cool.
>
> But what happens in carbuerated systems?  There is a bowl there
> collecting and holding a 1/2 cup of fuel along with the delivery lines
> and the pumps only deliver a few pounds of pressure vs the 10's of pound
> in an injected systems.  How do the carbs get away with it?
>
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