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In the fuel tank
Clean / replace fuel injectors.
It's at the back in front of the fuel tank. Just unplug the connectors and replace the filter.
The ( 2012 ) Ford Fiesta fuel tank is 47 liters ( 12.4 U.S. gallons )
The 2011 Ford Fiesta runs on regular unleaded.
The 2012 Ford Fiesta runs on regular unleaded.
The 2014 Ford Fiesta runs on regular unleaded.
The 2013 Ford Fiesta runs on regular unleaded.
Take it to a repair shop.
In the fuel tank
You don't fix it, you just replace it.
The electric fuel pump is INSIDE the fuel tank on a 1997 Ford Explorer