Carter M6405 Mechanical Fuel Pump

Carter M6405 Mechanical Fuel Pump

The Carter M6405 is a mechanical fuel pump built for OE-style fit, form, and function on select Pontiac applications. It uses a tube inlet, a single threaded outlet, and a gasket or seal is included for service replacement work.

Key Features

• Mechanical fuel pump design for carbureted fuel delivery systems
• Tube inlet with one threaded outlet for a secure fuel connection
• Outlet fitting thread size: 5/8-18
• Operating pressure range: 5 to 6.5 PSI
• Minimum flow rating: 40
• Gasket or seal included
• OE fit, form, and function focus for direct replacement use

Application Details

Built for select Pontiac vehicles, the Carter M6405 supports fuel delivery on 1972-1974 Pontiac Bonneville, Catalina, and Firebird models, plus 1973-1974 Pontiac Grand Am, Grand Prix, and LeMans applications. It also covers 1972-1973 Pontiac Bonneville and Catalina models with 3 line pump and long housing configurations, including air conditioning-equipped versions where listed. This part cross-references Airtex Fuel Pumps 40931 for the same application.

Common Problems It Can Help Address

• Hard starting caused by weak mechanical fuel delivery
• Fuel starvation under normal driving conditions
• Low fuel pressure at the carburetor
• Fuel leakage at the pump mounting surface when the seal is worn
• Poor drivability related to inconsistent pump output

Installation Notes and Tips

Verify the vehicle’s pump housing length, line count, and air conditioning configuration before installation. Confirm the 5/8-18 outlet thread size and threaded outlet connection match the existing fuel line setup. Replace the gasket or seal during service and inspect the mounting surface, fuel lines, and inlet routing for wear or contamination before final assembly.

Quality Assurance

Carter Fuel Systems focuses on OE-style fitment and application coverage with problem-solving design details for service replacement use. The M6405 is built to match the expected form and function for the listed Pontiac applications.