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News flash boys... PUMPS DONT SUCK.. atmospheric pressure
PUSHES the fuel into the pump.. the pump creates the
negative pressure(just like the piston does on the
engine).. thats why the pump companies tell you to
go larger on the inlet side..thats also why you dont
put a fine filter on the inlet side

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So if I mount the pump on top of the tank...it should never push fuel, since atmospheric pressure isn't feeding it right?
Or am I not understanding what you mean?

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No... you have 14.7 psi pushing on the fuel.. thats
a lot of vertical height
EDIT
when doing fine testing we like to use a measurement
of water(app. 30" of water is 1 psi) so if you turn the
psi into inch of water you an get a idea of the
vertical height... but understand the more you go
vertical the less pressure you have to push in the
fuel.. so it reduces the output