This is one of those situations where I'm completely stumped... I've gone through the usual steps to diagnose, but this doesn't make much sense. This is a 308 and for those familiar with the set-up, the fuel from the pump is routed through each carb, beginning with the front, driver's side, then the rear driver's side, then the passenger's side rear and finally the front passenger's side. Any excess fuel is routed back to the passenger's side fuel tank through a return line. My problem is, with the engine off, I let the fuel pump prime the system and after about 30 seconds, the LAST TWO carbs (the ones on the passenger's side) start to flood. By flooding, I mean that when I look down the carb throats, I see fuel dripping from the bottom edges of the auxillary venturis (the smaller tubes that are in the middle, which deliver the fuel from the main jets/emulsion tube wells). The first two carbs (on the driver's side) are bone dry and not dripping. What I've checked so far: - Fuel pump pressure is within spec @ 4.2 PSI (book calls for 3.6 to 4.9 PSI). - I've bench-tested the pump previously and it delivers the required 100L/hour volume. - Return fuel hose is NOT restricted. - I've replaced all four float needle valves with brand new ones from Pierce Manifolds and have the float heights set at exactly at spec (50mm from carb top). Is it possible I have TWO leaky floats? I can see the tops of the floats through the little vent holes in the carb tops so I think it's unlikely. Are the carb tops cracked? The needle valves maybe seating, but is there fuel coming out of somewhere else on the needle valve mounting boss(?). I was really stoked to get the car on the road today as the weather is perfect and I've finished the extensive rust-proofing work and other stuff that I've been working on the last several months.