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Totally INDEPENDENT recirculation polisher is preferred --- separate diptube (at the very BOTTOM of the tank) and separate discharge back into the tank ... with recirc. discharge near the BOTTOM or discharging onto a sidewall - to prevent foaming.
Yes indeed you can 'starve' the lift pump with a Walbro if the recirc system is 'cross-ported' into the fuel delivery system.
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