Carter M6622 Mechanical Fuel Pump

Carter M6622 Mechanical Fuel Pump

The Carter M6622 is a mechanical fuel pump built for OE-style fit, form, and function in select Cadillac applications. It is a direct replacement option for vehicles that use a 3-line pump, with coverage that includes Cadillac Eldorado, DeVille, Fleetwood, and Commercial Chassis models.

• Mechanical fuel pump design for carbureted fuel delivery systems
• Inlet outside diameter: 9.5
• Hose-style inlet with 1 inlet and threaded outlet with 1 outlet
• Outlet fitting thread size: 5/8-18 UNF-2B
• Minimum flow rating: 40
• Operating pressure range: 5.5 to 7
• Gasket or seal included
• Two mounting holes for installation alignment
• Compatible with select Cadillac 3-line pump applications

Fitment and Application Details

Compatible with 1969-1974 Cadillac Commercial Chassis, with 3 Line Pump; with Air Conditioning. Compatible with 1969-1974 Cadillac DeVille, with 3 Line Pump; with Air Conditioning. Compatible with 1969-1974 Cadillac Eldorado, with 3 Line Pump; with Air Conditioning. Compatible with 1969-1976 Cadillac Fleetwood, with 3 Line Pump. Compatible with 1975-1976 Cadillac Commercial Chassis, with 3 Line Pump. Compatible with 1975-1976 Cadillac DeVille, with 3 Line Pump. Compatible with 1975-1978 Cadillac Eldorado, with 3 Line Pump.

This part cross-references Delphi MF0184 for the same application.

Carter fuel systems are built around OE fit, form, and function, with coverage aimed at hard-to-match vehicle applications. The M6622 follows that approach by matching the mechanical pump layout used on the listed Cadillac models and by using the specified inlet and outlet configurations for proper fuel line connection. If you are replacing a worn mechanical fuel pump on a Cadillac Eldorado, DeVille, Fleetwood, or Commercial Chassis, this part number provides a direct-reference solution for the correct application.

Common Problems This Pump Can Address

• Hard starting caused by weak fuel delivery
• Fuel starvation under load or at cruising speed
• Low fuel pressure from a worn mechanical pump
• Fuel leaks at the pump body or line connections
• Driveability issues related to inconsistent carburetor supply

Installation Notes and Tips

Verify the vehicle’s 3-line pump configuration before installation, since fitment varies by model year and equipment. Confirm the inlet hose size, threaded outlet connection, and mounting-hole alignment against the original pump. Replace the gasket or seal during installation and inspect fuel lines for wear, corrosion, or cracking before returning the vehicle to service.

Quality Assurance

Carter positions this pump as an OE-style replacement with premium fit and function for the listed Cadillac applications. The M6622 is built to match the original mechanical pump layout and connection style used on the covered vehicles.