It depends on the part number. PFS-566 and PFS-1117 include the integrated fuel sending unit so your gauge reads correctly after installation. PFS-557 does not include the sender — you would reuse your existing sender or purchase it separately. Always check the 'Fuel Sending Unit Included' spec before ordering.

Flow rates vary by application. PFS-557 flows 185 LPH, suitable for higher-demand engines, while PFS-566 flows 43.3 LPH for lower-displacement or return-style fuel systems. Motorcraft matches flow rating exactly to the OE specification for each vehicle — no guessing required. Using the correct flow rating prevents lean conditions and avoids over-pressurizing injectors.

PFS-566 and PFS-557 include a strainer (PFS-557's strainer is integrated into the fuel module). PFS-1117 does not include a strainer. If your replacement does not include one, reuse the original strainer only if it is clean and undamaged — a clogged strainer is a leading cause of premature pump failure.

For Ford, Lincoln, and Mercury vehicles, Motorcraft is Ford's own OEM service-parts brand — the same spec the factory installs. Aftermarket pumps vary in flow tolerance and connector fit; a mismatch can trigger P0087 (fuel pressure too low) or cause erratic gauge readings. If your vehicle is under a powertrain warranty or emissions warranty, using Motorcraft maintains Ford's factory warranty coverage. The premium is typically justified on high-mileage or turbocharged applications where pump tolerance matters most.