The Ford 6C3Z-9189-A is the genuine 6-port fuel tank selector valve that switches fuel supply and return between the front and rear tanks on dual tank 7.3L OBS Powerstroke trucks.

It is Ford's current service part and supersedes the original OBS valve, F4TZ-9189-A. A failing valve can let fuel return to the wrong tank, overfill one tank, or cause hard starting and loss of power.

• Genuine Ford: Current Ford service part number.
• Supersedes F4TZ-9189-A: Replaces the original OBS valve.
• 6-Port Design: Switches supply and return lines.
• Dual Tank Trucks: Controls front and rear tank feed.
• Plug-In Replacement: Uses the factory connector and lines.

Technical Specifications

• Part Number: 6C3Z-9189-A
• Manufacturer: Ford
• Replaces: F4TZ-9189-A
• Type: 6-port electric fuel tank selector valve
• Application: Dual fuel tank diesel trucks

Vehicle Fitment & Technical Installation Notes

• Fitment: 1994-1997 Ford F-250 and F-350 7.3L OBS Powerstroke with dual tanks, as the replacement for F4TZ-9189-A. Ford also lists it for 2000-2016 Super Duty diesels.
• Installation Tip: Relieve fuel pressure and label each line before removing the old valve so the supply and return lines go back on the correct ports.