Delphi MF0042 Mechanical Fuel Pump

Mechanical Fuel Pump for Jeep Applications

The Delphi MF0042 is a standard replacement mechanical fuel pump for gasoline systems. It is built for select Jeep Cherokee, CJ5, J10, J20, and Wagoneer applications from 1972-1975, with OE-focused engineering drawn from Delphi’s long history supplying automakers.

Key Features

• Mechanical fuel pump for gasoline engines
• System pressure: 5 psi
• Average flow rating: 25
• Outlet fitting thread size: 1/2-20 UNF
• Hose bead inlet with 0.313 in. outside diameter
• Threaded outlet with 1 outlet port
• Gasket or seal included
• Package contents: mechanical fuel pump, gasket, instruction sheet
• Standard replacement grade

Detailed Description

Delphi MF0042 is a mechanical fuel pump engineered for direct replacement use on classic Jeep fuel systems. It is listed for 1972-1975 Jeep CJ5, 1972-1975 Jeep Wagoneer, 1974-1975 Jeep Cherokee, 1974-1975 Jeep J10, and 1974-1975 Jeep J20 applications. The pump is specified for gas fuel type, 5 psi system pressure, and a 25 average flow rating, with a hose bead inlet and threaded outlet connection for the fuel line.

Delphi’s OE heritage is reflected in the design approach behind this part number, MF0042, which is intended to match the needs of original-style mechanical fuel delivery on older Jeep models. This part cross-references Airtex Fuel Pumps 6505 and Carter M6505 for the same application.

Common Replacement Reasons

• Hard starting caused by weak fuel delivery
• Fuel starvation during acceleration or load
• Low fuel pressure in a carbureted system
• Fuel leakage at an aging pump body or connection
• Restoration replacement for original Jeep fuel system service

Installation Notes and Tips

Confirm inlet and outlet connection style before installation: this pump uses a 0.313 in. inlet outside diameter, a hose bead inlet, and a 1/2-20 UNF threaded outlet. Use the included gasket during installation and verify fuel line routing, mounting surface condition, and system pressure requirements before returning the vehicle to service. Always check for leaks after priming the fuel system.

Quality Assurance

Delphi builds aftermarket parts using OE experience and application knowledge developed through decades of supplying major automakers. MF0042 is a standard replacement mechanical fuel pump backed by that OE-focused engineering approach.