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Pitts S1C Fuel Tank Vents

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birkelbach

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I'm trying to finish up the fuel system on my Pitts S1C project. I didn't build this airplane, I'm trying to complete it. It's an original S1C built from scratch (1972 Plans). The project included the tank which seems to be well made but I can't figure out how to do the venting. As far as I can tell there are no internal tubes, but there are plenty of ports. There is a port on top near the filler neck that the original builder put a Tee in. There is a fitting at the bottom rear of the tank and another on the top front of the tank. There is also the larger port for the flop tube. I've looked through the plans and the manual and I can't find a good description of how to properly vent the tank.
 

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