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Mk4 mondeo (2007-2014) has no electric pump in the tank, it won't prime fuel by turning the key, in fact turning the key will do nothing for priming a new fuel filter.

Lift pump is part of high pressure pump combined into one unit. It "pulls" fuel from the tank by using vacuum I believe.

Car needs to be primed manually after opening fuel lines.

The only thing inside the fuel tank is the fuel sender unit.
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