Yes, it is a very good possibility that replacing the fuel pump did cause the fuel leak at the fuel tank, especially if the vehicle did not leak fuel from the fuel tank before the fuel pump was replaced, and the seal to the fuel sending unit/fuel pump assembly might have slipped out of place or was damaged when the fuel sending unit/fuel pump assembly was installed onto the fuel tank, the fuel lines might not be properly attached to the fuel sending unit/fuel pump assembly, the filler hose to the fuel tank might not be properly tightened, or even damage to a fuel line, the fuel tank itself, or a vent, from not properly installing the fuel tank into the vehicle. Those would all be a problem with quality workmanship and if any of those reasons are responsible for the fuel leak and the repairs were done at a repair facility then they should warranty the repair for their mistake at no additional cost to you.
However, road debris could also have damaged the vehicle and that would not be anything that would be covered by a warranty, and someone who is qualified and objective should inspect the vehicle to determine exactly where the fuel leak is coming from so that a proper course of action can be decided.
Could be the seal for the sending unit is bad, gotta pull the tack to check that, or a fuel line is bad
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