Fuel return based on AAM Fuel Return Kit at a fraction of cost. I have machined an adapter (similar to AAM's) to replace fuel pressure regulator.This will provide much higher flow of fuel to Venturi to pick up fuel from LH side of tank.
Tricky part (for me!), was making pipework fit between AN-4 bulkhead fitting in top plate and adapter. AAM use a crimped hose with long radius bend to go into AN-4 to 1/8" NPT 90 deg adapter which fits snug. I'm using AN-4 braided teflon hose and fittings which take up a bit more space. In hindsight I should have used rubber hose with barbed hose tails and jubilee clips as others have done.
CJ Motorsports suggest increasing the swirl jet to about 0.080" for 225l Walboro, this could be increased further to 0.100" or 0.110" for larger pumps. I will probably go for 2mm (about 0.078") nearest drill bit I have, should be OK to pick up fuel from RH side of tank.
4l swirl tank should eliminate any possibility of starvation on hard track cornering.
Dave
Yeah, agree not much room, but what you have will work fine.
I did away with my surge tank and external pump and went with this:
http://cj-motorsports.com/products/cjm-twin-pump-350zg35