446-5408 12V Fuel Transfer Pump for CAT Engine C4.4 C7.1 Excavator 312D2 320D2

446-5408 12V Fuel Transfer Pump for Caterpillar C4.4 C7.1

The 446-5408 / 4465408 12V fuel transfer pump is used for Caterpillar engine fuel supply applications. It helps deliver fuel from the tank side to the engine fuel system and is commonly referenced for C4.4 and C7.1 engine applications.

This pump is mainly selected by the original pump number, voltage and connector layout. Machine model information is useful for initial identification, but final fitment should be verified by the old pump label, plug type, mounting position and fuel line direction.

446-5408 Part Number Focus

The main part number for this page is 446-5408. The non-hyphen search format 4465408 may also appear in parts searches, supplier listings and maintenance records.

To keep selection accurate, this page focuses on the 12V 446-5408 fuel transfer pump. Fuel pumps with similar appearance should not be treated as the same part unless the voltage, connector, mounting and inlet outlet layout are confirmed.

Application and Fitment Reference

This 446-5408 Caterpillar fuel transfer pump is commonly referenced for Caterpillar C4.4 and C7.1 engine applications. Model references may include 312D2, E312D2 and E320D2.

The model list should be used as a fitment reference only. Before ordering, compare the old pump number, voltage mark, electrical connector, mounting points, inlet outlet direction and engine nameplate.

Common Failure Symptoms

• Hard starting: the engine may take longer to start when fuel delivery is weak.

• Power loss under load: unstable fuel supply may reduce engine response during operation.

• Engine stalling: the engine may stop after running if fuel supply is interrupted.

• No pump operation: wiring, fuse, relay, ground or connector issues should be checked before replacing the pump.

• Fuel leakage: inspect the pump body, hose fittings, clamps and fuel line connections.

Troubleshooting Before Replacement

• Confirm that the old pump part number is 446-5408 or matches the 4465408 search format.

• Check that the old pump is a 12V unit before ordering.

• Inspect fuel filters, fuel lines and the tank-side pickup for blockage or air leakage.

• Check the electrical connector, fuse, relay, wiring harness and ground point.

• Confirm whether the fault is caused by the pump, fuel contamination, blocked filter or electrical supply issue.

Installation and Maintenance Notes

• Turn off the machine and isolate electrical power before replacement.

• Mark the fuel inlet and outlet direction before removing the old pump.

• Keep fuel line openings clean during installation.

• Replace or inspect the fuel filter if contamination is found.

• Prime the fuel system after installation according to the machine service procedure.

• Start the engine and check idle stability, pump operation and fuel leakage.

Fitment Check Before Ordering

To reduce wrong orders, please send the machine model, engine model, machine serial number, old pump label photo, connector photo, mounting photo, inlet outlet photo and voltage marking before quotation.

FAQ

Q: What is 446-5408?

446-5408 is a 12V fuel transfer pump used for Caterpillar engine fuel supply applications.

Q: What is the relationship between 446-5408 and 4465408?

4465408 is the non-hyphen search format of 446-5408. Both formats may appear in parts searches and supplier listings.

Q: Which engines are commonly referenced for this pump?

Common engine references include Caterpillar C4.4 and C7.1. Final fitment should still be verified by the old pump number, voltage and connector.

Q: Which machine models are commonly referenced?

Model references may include CAT 312D2, E312D2 and E320D2. These should be treated as fitment references only.

Q: What should be checked before ordering?

Check the old pump number, voltage, connector plug, inlet outlet direction, mounting position, engine model and machine serial number. Clear photos of the old pump are recommended.