Check the fuel pressure first (see "Checking the fuel pressure in the fuel system"). If the pressure in the system is below 360 kPa (3.6 kgf/cm²), the fuel pump must be replaced, since its design is difficult to disassemble and the pump components (the electric pump itself, filters and fuel pressure regulator) are not supplied as spare parts.
You will need: a hardwood drift, a hammer, and a container to drain the fuel.
1. Remove the fuel tank (see "Replacing the fuel tank and its filler pipe").
NOTE: It is necessary to remove the fuel tank to replace the fuel pump because the Ford Focus II does not have a hatch in the base of the body above the fuel module, so access to it is impossible with the tank installed on the vehicle.
2. Loosen the tightening of the clamping ring securing the fuel pump module to the fuel tank by turning the ring counterclockwise with gentle
with hammer blows through a wooden block..
3. …and unscrew the ring from the fuel tank neck.
4. Carefully remove the fuel pump module, turning it so as not to damage or displace the fuel level indicator sensor float, and drain the fuel from it into a pre-prepared container.
5. Remove the sealing ring and inspect it. Be sure to replace the ring if it is torn or too compressed.
6. Install the fuel pump module in the reverse order of removal.
WARNING: The fuel pump module must be installed in a strictly defined position, aligning the marks on the fuel tank (in the photo, the mark is highlighted in white for clarity) and on the module body (in the photo, the mark is highlighted in black for clarity), otherwise it will not be possible to connect the fuel lines to the module fittings.