Hygrade FM728D Carburetor Power Valve

Hygrade FM728D Carburetor Power Valve

Restore proper fuel metering in Holley-equipped carburetors with the Hygrade FM728D carburetor power valve. This direct-fit OE replacement is built for Holley 2-barrel and 4-barrel carburetors, including 2300, 4150, 4160, 4165, and 4175 models. It is a practical choice for Ford, Mercury, Chevrolet, Pontiac, and other classic applications that rely on accurate enrichment under load.

Key Features

• Direct-fit OE replacement for Holley carburetors
• Fits Holley 2 Bbl. and 4 Bbl. carburetor setups
• Supports Holley 2300, 4150, 4160, 4165, and 4175 carburetor types
• Built from quality materials for demanding underhood conditions
• Individually tested for reliability and consistent operation
• Hygrade FM728D cross-references Bosch 13500 for the same application

Detailed Description

The Hygrade FM728D is a carburetor power valve, also referred to as an economizer, for Holley carburetors used across a wide range of vintage Ford and Mercury vehicles. It helps maintain proper fuel delivery when engine load increases, making it a key service part for drivability and throttle response on classic carbureted engines. Common fitment includes 1970-1980 Ford Bronco, F-Series trucks, Econoline vans, Mustang, LTD, Thunderbird, and select Mercury models, along with additional Chevrolet, Pontiac, Buick, Chrysler, and Dodge applications listed in the fitment data.

Hygrade manufactures this replacement with complete process control and extensive testing to support dependable performance. If you are servicing a Holley 2300, 4150, 4160, 4165, or 4175 carburetor, FM728D provides a straightforward replacement path for restoring correct enrichment behavior.

What It Helps Fix

• Rich or lean hesitation during acceleration
• Poor throttle response under engine load
• Fuel delivery issues caused by a worn power valve
• Driveability problems in Holley carburetors with enrichment faults
• Service needs on classic Ford and Mercury carbureted engines

Installation Notes and Tips

Verify the carburetor make and model before installation. This part is listed for Holley 2-barrel and 4-barrel carburetors, including 2300, 4150, 4160, 4165, and 4175 types. Match the existing carburetor number and application notes in the fitment data, especially on older Ford and Mercury vehicles where multiple carburetor calibrations were used. Clean the mating surfaces and inspect the carburetor for wear or contamination before replacing the valve.

Quality Assurance

Hygrade states that this OE-style replacement is made with high-quality materials, undergoes extensive testing, and is produced under complete quality control throughout manufacturing.