Mechanical pumps are based on a diaphragm and check valves - so they are already in place. Most of today's problems are with the fuel just percolating off.
Even with the vapor return, the pickup for the return is at the very top of the chamber inside the mechanical pump, so in theory the cavity would remain full of fuel.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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