Fits The Following Vehicles: for Ford F-150 1994-1999 for Ford F-250 1993-1999 for Ford F-350 1993-1997 for Ford F Super Duty 1994-1997 for Ford F-250 F-350 F-450 F-550 Super Duty 1999-2001 Replace OE#: F4SZ9C968A F4TZ9C968B How Does A Pressure Regulator For Fuel Injection Work? The Electronic Fuel Injection System's fuel pressure is maintained in part by the fuel pressure regulator. The fuel pressure regulator permits more fuel to reach the engine when the fuel system requires higher fuel pressure. Since that is how fuel gets to the injectors, this is significant.
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