Part Number: D8RZ-9E589-B Brand: Ford (OEM Service Part) Condition: New Old Stock (NOS) Quantity: 1 valve Packaging: Original Ford box (marked “ONE 2-25419”) Includes: Valve body, spring, plunger, wire lead

Description: This is a genuine NOS Ford carburetor bowl vent valve, part number D8RZ-9E589-B, correct for select 1978–1986 Ford trucks and vans equipped with the 4.9L inline-six (300 CID) engine. Also known as a thermal vent valve, this component regulates vapor flow from the carburetor bowl to the charcoal canister based on engine temperature.

Fitment Highlights:

• 1978–1986 Ford F100, F150, F250, F350

• 1978–1986 Ford Bronco

• 1978–1986 Ford E-Series vans

• May fit other platforms using similar emissions setups

Function: This valve helps control fuel vapor emissions by opening or closing based on engine heat. It’s a critical part of the evaporative emissions system and often overlooked during restorations. Ford’s base number 9E589 covers thermal vent valves used in various emissions configurations.

Part Number Logic:

• D8 = 1978 model year

• R = Engineering Division

• Z = Service part

• 9E589 = Thermal vent valve / carb bowl vent

Condition Disclosure: This is a vintage NOS part. It has never been installed and includes original packaging. May show minor shelf wear or oxidation from long-term storage.

Also Known As: This part is commonly referred to as a thermal vent valve, carburetor bowl vent valve, or carb bowl vent solenoid. It regulates vapor flow from the carburetor bowl to the charcoal canister based on engine temperature. Ford’s base number 9E589 covers this emissions function across multiple platforms.