Delphi MF0040 Mechanical Fuel Pump

Delphi MF0040 Mechanical Fuel Pump

The Delphi MF0040 is a standard replacement mechanical fuel pump for gasoline applications that require a 4 psi system pressure and an average flow rating of 25. Built with Delphi OE heritage and backed by a broad aftermarket portfolio, it is a direct-fit option for select Nissan Sentra and Nissan Pulsar NX models.

• Mechanical fuel pump for gas applications
• 4 psi system pressure
• Average flow rating: 25
• 0.250 in. inlet outside diameter and 0.250 in. outlet outside diameter
• Hose bead inlet and outlet connections
• Outlet quantity: 2
• Gasket or seal included
• Package contents: mechanical fuel pump, gasket, instruction sheet
• Standard replacement grade

OE-Style Fuel Delivery Performance

Delphi MF0040 is engineered as a mechanical fuel pump replacement for older carbureted fuel systems that rely on consistent low-pressure delivery. Its OE-based design reflects Delphi’s long history supplying automakers, helping maintain proper fuel supply on vehicles such as the Nissan Sentra and Nissan Pulsar NX. This part cross-references Carter M70041 for the same application.

Used For These Fuel System Issues

• Hard starting caused by weak fuel delivery
• Fuel starvation under load or at higher engine demand
• Low fuel pressure in a mechanical pump system
• Intermittent stalling related to inconsistent pump output
• Replacement of a worn pump on a Nissan Sentra or Nissan Pulsar NX

Installation Notes and Tips

Verify inlet and outlet hose size before installation, since this pump uses 0.250 in. hose bead connections. Confirm the vehicle’s fuel system is designed for 4 psi mechanical pump operation and follow the included instruction sheet during installation. For fitment, this part is listed for 1983-1987 Nissan Sentra, 1983-1984 Nissan Pulsar NX, and 1983 Nissan Pulsar.

Quality Assurance

Delphi builds this replacement pump using OE experience and application knowledge developed through decades of supplying original equipment to major automakers. The MF0040 is positioned as a standard replacement part for select Nissan fuel systems.