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I dont think those pumps have the ability to pull fuel out or up if mounted above the tank.
The pump needs to be mounted below the opening of the inlet tube that is inside that gas tank, it is shipon feed to the inlet of the pump at first.
Once the flow is established the pump will to some degree create some of its own low pressure on the inlet side to aid in the coninual flow of gas out of the tank.
Thats my take on it
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