I decided long ago I never liked that design - some guys have those shields that 'catch' the fuel but with the airflow i'm not sure how well
that will work.
What I did that I have tested (when the carbs are out of sync is a great time to overflow your carbs!) and worked great was to run a line from the carbs towards the firewall about 4-5 inches (not much more than that!), and put a tee in pointing UP with a few inches going UP on the firewall. This gives you an air vent pipe with adequate height to prevent spillage for EACH carb.... take each of those tees down to exit underneath the aircraft. I later tee them together and insert a metal overboard tube with vent holes cut in that metal to prevent syphoning effect or backpressure inside my carbs. Lets see if I can draw this:
Code:
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|---CARB CARB---|
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metal tube
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You get the idea.... it's worked great. Don't try and use just one airvent, I found that it just won't FLOW downhill like you need it to and a fuel-filled carb overflow tube is no good because that needs to normalize with atmospheric pressure as best I understand for proper mixture.
Someone will likely jump all over me here but this system works excellent and produces minimal risk if you ask me compared to dumping fuel UKNOWINGLY all over your hot exhaust....
~Wild