Sparta PN3251 Fuel Pump Module Assembly

Fuel Pump Module Assembly for Mercedes-Benz

The Sparta PN3251 fuel pump module assembly is a specific-fit, in-tank replacement for select Mercedes-Benz GL450, GL550, ML350, ML500, and ML550 models. Built for gasoline applications, it includes the fuel sending unit, strainer, gasket/seal, and float arm for a complete service replacement.

Sparta, distributed by Delphi, is positioned for higher-mileage and earlier-model vehicles, with OE-informed fit and performance standards. If you need a Mercedes-Benz fuel pump module assembly that matches the original layout and electrical setup, PN3251 is built for that job.

Key Features

• Part number: PN3251
• Specific-fit fuel pump module assembly for gasoline vehicles
• In-tank electric turbine pump design
• 12-volt system with 1 connector and 5 terminals
• Fuel sending unit included
• Strainer included with internal inlet strainer
• Gasket/seal included; nitrile rubber seal material
• Quick-connect outlet with 0.313 in. outside diameter
• Standard replacement grade
• Maximum pressure: 80 psi; minimum pressure: 58 psi
• Average flow rating: 21
• Housing material: plastic

Detailed Description

PN3251 is an in-tank fuel pump module assembly engineered for direct replacement on select Mercedes-Benz SUVs and crossovers. It is built for gasoline fuel systems and uses an electric turbine pump design with a quick-connect outlet, blade terminals, and a female connector with an oval shape. The module includes the fuel sending unit and float arm, helping restore fuel level reporting along with fuel delivery.

This part cross-references Monroe Shocks & Struts (e.g., A46518, A46521) for the same application. It is a standard replacement option for 2006-2012 Mercedes-Benz GL450, 2008-2012 Mercedes-Benz GL550, 2006-2011 Mercedes-Benz ML350, 2008-2011 Mercedes-Benz ML550, and 2006-2007 Mercedes-Benz ML500. Search terms such as Mercedes-Benz GL450 fuel pump module assembly PN3251 and Mercedes-Benz ML350 in-tank fuel pump replacement apply directly to this part.

What It Helps Address

• Hard starting caused by weak fuel delivery
• Engine stalling from inconsistent pump output
• Incorrect fuel gauge readings from a worn sending unit
• Low fuel pressure conditions in the tank-mounted system
• Fuel starvation under load from a failing module assembly

Installation Notes and Tips

Confirm the connector style, terminal count, outlet type, and pressure requirements before installation. This module is specific fit and uses no included mounting hardware or lock ring, so reuse or source the required tank-side components as needed. Replace the seal during service and verify the fuel line quick-connect is fully seated before cycling the ignition.

Compatible With 2007-2012 Mercedes-Benz GL450, N/A; 2008-2012 Mercedes-Benz GL550, N/A; 2006-2011 Mercedes-Benz ML350, N/A; 2008-2011 Mercedes-Benz ML550, N/A; and 2006-2007 Mercedes-Benz ML500, N/A. For Mercedes-Benz GL450 fuel pump module assembly replacement or Mercedes-Benz ML550 fuel pump service, PN3251 should be matched to the vehicle’s original configuration.

Quality Assurance

Sparta is distributed by Delphi, an OE full-line fuel supplier, and is aimed at higher-mileage and earlier-model vehicles where correct fit and fuel-system performance matter. PN3251 is built as a direct replacement fuel pump module assembly for the listed Mercedes-Benz applications.