Carter M4641 Mechanical Fuel Pump

Reliable Mechanical Fuel Pump for Classic GM Vehicles

The Carter M4641 mechanical fuel pump is engineered to deliver consistent fuel flow and pressure for select Buick, GMC, Oldsmobile, and Pontiac models. Designed with durable cast housing and precise inlet and outlet fittings, this pump supports optimal engine performance in vehicles like the Pontiac Firebird and Buick LeSabre.

• Mechanical fuel pump with cast housing for durability
• Threaded inlet with 9.5 mm outside diameter
• Inverted flare outlet with 9.0 mm outside diameter and 5/8-18 unf-2b thread size
• Includes gasket or seal for secure installation
• Two mounting holes for stable attachment (mounting hardware not included)
• Minimum flow rating of 30 gallons per hour and minimum pressure of 7 psi
• Single outlet design optimized for fuel delivery

Detailed Product Description

The Carter M4641 mechanical fuel pump is specifically designed for use in classic GM vehicles such as the Buick Century, Oldsmobile Cutlass Supreme, Pontiac Catalina, and GMC P2500. Its cast housing provides strength and resistance to wear, while the threaded inlet and inverted flare outlet ensure a secure and leak-free connection to the fuel lines. The pump’s minimum flow rating of 30 gallons per hour and minimum pressure of 7 psi support steady fuel delivery under typical operating conditions. This pump includes a gasket or seal to help maintain a tight fit during installation, although mounting hardware is not included. With two mounting holes, it can be securely fastened to the engine block for reliable operation.

Compatible Vehicles and Applications

• Buick models: Century, LeSabre, Skylark
• GMC models: P2500
• Oldsmobile models: Cutlass, Cutlass Supreme, Delta 88, Omega, 88
• Pontiac models: Bonneville, Catalina, Firebird, Grand LeMans, LeMans, Phoenix, Regal, Riviera

Common Issues Addressed by This Fuel Pump

• Inconsistent fuel delivery causing engine hesitation or stalling
• Low fuel pressure affecting engine performance
• Fuel leaks due to worn or damaged seals
• Mechanical pump failure from wear or corrosion
• Replacement for original equipment in classic GM vehicles

Installation Notes and Tips

Ensure the mounting surface is clean and free of debris before installation. Use the included gasket or seal to prevent fuel leaks. Verify that the inlet and outlet fittings match your vehicle’s fuel line connections—threaded inlet (9.5 mm OD) and inverted flare outlet (9.0 mm OD, 5/8-18 unf-2b thread). Since mounting hardware is not included, retain or source appropriate bolts for secure attachment. After installation, check for leaks and proper fuel pressure before operating the vehicle.

Quality Assurance and Warranty

The Carter M4641 mechanical fuel pump is manufactured to meet OEM specifications for fit and function in compatible Buick, GMC, Oldsmobile, and Pontiac models. It undergoes quality control testing to ensure reliable fuel delivery and durability. This product includes a gasket or seal to support proper installation. Warranty details should be confirmed with the distributor or manufacturer.