I have the smaller wing tanks(7.5 gals I thinnk). I tried to run them dry yesterday and start using my header tank, which I would land, and fill the wing tanks to see my useful fuel in my wing tanks. I flew and flew with the wing gauge flat on bottom, and never did see my header tank start to go down any. When I filled my wing tanks(it was almost dark by now), I put in 9.8 gallons. My question is, are there different cork-gauges for the smaller tanks than the 9 gallon tanks. My wing tanks are marked 9 gallons, but when I removed one to have it rebuilt by John Wright, it was the smaller size. Thanks for reading this. Gary
