The Ford F81Z-9D308-BA is a genuine OEM rigid steel fuel line assembly for the fuel filter bowl on 1999–2003 7.3 Powerstroke engines. It routes pressurized fuel from the fuel bowl assembly directly to the driver side (left bank) cylinder head fuel rail port. Ford constructs this line from heavy-wall coated steel tubing bent to exact factory geometry, complete with integrated threaded tube nuts and compression sealing sleeves.

Stripped tube nut threads, crushed sealing olives, or hairline fatigue cracks that spray diesel fuel across the engine valley and wiring harness are what this line fixes. Repeated engine vibration, vibration bracket failures, and routine maintenance around the fuel bowl or turbocharger cause the factory line to work-harden and fail to seal once loosened. It is the driver side metal fuel line assembly only.

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
• Driver side cylinder head to fuel filter bowl feed line
• OEM rigid steel tubing
• Pre-formed hard line only

Relieve fuel pressure and drain the filter bowl before unscrewing the line nuts. Start both ends by hand into the fuel bowl fitting and the cylinder head port to ensure proper thread engagement and prevent cross-threading the brass ports. Tighten each fitting progressively and verify that the line does not contact adjacent wiring harnesses or brackets before starting the engine to bleed air.