Ford fuel pumps

Pulled the pump module out of my 2000 Contour. Looked at it a long time trying to figure out what's happening. Somehow the fuel in the tub where the
fuel pump is, has to be at a higher level than the in tank when it's low. How?
Al
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Are you sure it works by sucking fuel in? Maybe it just pressurizes the tank and the fuel is pushed out the outlet line.
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