One observation of these posts- there are some references to pressure on the fuel in the float chamber. I've never seen a carb without a vent to atmosphere from the the float chamber.
I may be missing the point of having a return-to-tank line from between the pump and carb. It sounds to me like a crutch for a failing float system (or too high a pump pressure). ???
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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