Digging up this old thread as it seems to be appropriate to my question, too...
I'm building the second engine for my D.VII (first was a D.IIIau) which is a D.IIIa and I have found reference pictures of where the thick lines go from the housing on which the air pump is mounted, but not where the thinner line from the big brass pump-part should go exactly. Since the two thicker lines go to the sump, does the thinner one run somewhere to the fuel tank? Or to the standing thing that WNW forgot on the left-hand side of the crankcase beteween the first and second cylinder (counting from the prop boss, not the flywheel). Or was that something on the aü engine only?
Thanks in advance!
Jeroen