The Motorcraft KFL-33 is a genuine OEM pre-formed rubber fuel hose designed for the fuel filter bowl and return assembly on 1999–2003 7.3 Powerstroke engines. Ford markets this under engineering part number F81Z-9C323-CB. It features an exact factory-molded contour and a fuel-resistant inner liner engineered to withstand diesel fuel, extreme heat, and engine vibration in the valley.

Dry rot, fuel weeping, or swelling and cracking around the hose barb fittings on the driver-side fuel bowl are what this hose replaces. Generic straight fuel line kinks when forced into the tight bend around the regulator and fuel housing, restricting fuel return and leading to pressure irregularities. It is the pre-formed fuel hose only; hose clamps and fittings are sold separately.

It fits 1999–2003 7.3 Powerstroke trucks, Excursions, and E-Series vans.

Fitment

• 1999–2003 Ford F-250 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-350 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-450 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-550 Super Duty 7.3L Powerstroke
• 2000–2003 Ford Excursion 7.3L Powerstroke
• 1999–2003 Ford E-Series Vans 7.3L Powerstroke
• Direct fit for factory fuel filter bowl return assembly
• Factory-molded hose only

Relieve fuel system pressure and place shop rags below the fuel bowl before disconnecting old lines to catch residual fuel. Inspect the mating metal tube and barb for corrosion or burrs that could tear the new rubber liner. Use proper fuel injection-style spring or worm clamps to ensure an airtight seal without cutting into the outer hose jacket.