Bill Freeman wrote:

Third, the latest model C182 system has an additional set of vents
added directly into the fuel lines right where the lines leave the tanks.
This is unique, but I can be pretty certain that this system was
 installed to solve a specific problem, perhaps the counterflow fuel
vapor bubbles problem that I mentioned recently as applying to P
or T210s.

Someone out there must have the shop manuals or even POH for some
 low wing designs.  Let's put these up on the newsletter and examine
 them so we can learn.  Rediscovering arcane fuel flow failure modes
 is a very untidy business and if we don't learn from existing fuel
system designs, we are doomed to have a certain percentage of
engine stoppages. Sir Isaac Newton  siad "If I have been able to
see farther than others, it was because I stood on the shoulders
of giants."   Let's stand on some shoulders of experienced fuel s
ystem engineers and test pilots with our fuel system designs, and
maybe fly farther.

Remember - The laws of physic will be strictly enforced, and ignorance
of the law is no excuse.

Bill

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