Fuel system explained
Fuel Pump gaskets: Reinstall fuel pump screen, fuel pump cover with new cork cover gasket, TCM P/N 643915 and new bolt gasket P/N 643914. Torque bolt to 30 +/- 5 inch-pounds or 2.5 foot/pounds.
Ventless Wing Fuel System Diagram
2273H has an extensively modified fuel system. Both wing tanks are non vented. The only venting is on the header tank via the gage. The system works like a champ. Unlike 09H which was forever siphoning fuel out the cap in flight, this works perfectly. The return to the left tank is made where the original fuel gauge was mounted. The fuel gauge was replaced with a wing mounted float type gauge.
Paul M. Anton