ORIGINAL: cutaway
ORIGINAL: GuyIncognito
2. try a double clunk tank set up like the CL guys use.
That's a uniflow clunk setup. It doesn't provide "more pressure" per se, rather it works to equalize the pressure within the tank at various attitudes because vent air bubbles are always being drawn through fuel and what comes in always equals what goes out. Initial needle settings on a uniflow will typically have to be set a few turn richer than on conventional venting.
Uniflow will give very consistent runs until the fuel is almost completely spent. I don't know why more people don't use it. Maybe they don't understand it.
IMHO Uniflow is a bit overly complicated. On .40 & .60 size I just use two lines and attach the vent line to the muffler pressure line. Solves the problem by pressurizing the tank.