3928143 Fuel Transfer Pump for Cummins 4BT 6BT Engine

3928143 Fuel Transfer Pump for Cummins 4BT 6BT B Series Engines

The 3928143 fuel transfer pump is used for Cummins 4B 4BT 4BTA 6B 6BT 6BTA B Series diesel engine fuel supply systems. It is a mechanical fuel lift pump used to move diesel from the tank side toward the engine fuel system before injection pressure is created.

This page is focused on 3928143 as the main search number. Related references such as 3904374 and 4983584 can stay on this page as cross reference numbers because they are commonly listed in the same Cummins B Series fuel transfer pump group.

3928143 Pump Identification and Reference Data

When Is the 3928143 Fuel Transfer Pump Usually Replaced?

This pump is usually checked when a Cummins B Series engine has hard starting, unstable idle, weak fuel delivery, power loss under load, air bubbles in the fuel line, fuel leakage near the pump, or repeated fuel filter emptying after shutdown.

For older 4BT and 6BT engines, fuel supply problems may also come from cracked hoses, blocked filters, dirty fuel tanks, loose fittings or air entering the suction side. The transfer pump should be checked together with the fuel lines and filter system.

If the old pump is still available, compare the mounting face, lever shape, fittings and gasket before placing the order. This is safer than relying only on the engine model.

Application Scene: Cummins B Series Fuel Supply Repair

Cummins 4BT and 6BT engines are used across many machine types, including construction machinery, trucks, agricultural equipment, generator sets, forklifts and industrial engines. Because of this wide application range, buyers often search the same pump by different terms: fuel transfer pump, fuel lift pump, fuel feed pump or mechanical fuel pump.

The 3928143 pump is suitable for a product page under Fuel Transfer Pump or Fuel Lift Pump, not under Fuel Injection Pump. It is a low-pressure supply pump, not a high-pressure injection pump.

For equipment with rebuilt engines or swapped fuel systems, the old pump photos are more reliable than the machine model alone.

Common Symptoms and Inspection Points

How to Confirm 3928143 Before Ordering

Before ordering 3928143, compare the old pump number, mounting holes, pump lever, gasket shape, inlet fitting, outlet fitting and engine model. If the visible number on the old pump is 3904374 or 4983584, it may still belong to the same checking group, but the physical pump should be compared before shipment.

For remote purchasing, send photos of the old pump from the front, back, side, fittings and mounting face. This helps confirm whether the replacement pump matches the actual engine fuel system.

Topvelsun can help compare the supplied part number and photos before order confirmation to reduce wrong-part risk.

Installation Notes for Mechanical Fuel Transfer Pumps

Clean the pump mounting surface before installation. Old gasket material, dirt or uneven contact may cause fuel leakage or air entry into the fuel system.

Check the inlet and outlet direction before tightening the fuel lines. Reversed connections or incorrect fittings can cause no-start or low-fuel-supply symptoms after installation.

Inspect or replace the fuel filter during pump replacement. A restricted filter can make a new transfer pump appear weak even when the pump is functioning correctly.

After installation, prime the fuel system, remove air from the line, check for leaks, and test idle stability and engine power under load.

Why Source 3928143 from Topvelsun?

Topvelsun supplies replacement fuel system parts for construction machinery, trucks, generator sets, agricultural equipment and industrial diesel engines. For 3928143 fuel transfer pump orders, we help buyers check the old pump number, engine reference, mounting details and fitting direction before shipment.

This product is suitable for repair workshops, fleet maintenance teams, diesel engine rebuilders, parts distributors and overseas buyers working on Cummins 4BT 6BT B Series fuel supply repair.

FAQ

Is 3928143 the same type of pump as 4983584 and 3904374?

Yes. 3928143, 4983584 and 3904374 are commonly listed in the same Cummins B Series fuel transfer pump reference group. Final fitment should still be checked by the removed pump and mounting style.

What engines can use the 3928143 fuel transfer pump?

3928143 is commonly used for Cummins 4B, 4BT, 4BTA, 6B, 6BT and 6BTA engine references. The old pump and engine configuration should be verified before ordering.

Is this a fuel injection pump?

No. This is a fuel transfer pump or fuel lift pump for low-pressure fuel supply. It should not be described as a high-pressure fuel injection pump.

What should be checked before buying this pump?

Check the old pump number, mounting holes, lever shape, gasket, inlet outlet direction, fuel line fittings and engine model. Photos of the removed pump are recommended before shipment.

Can Topvelsun help verify the correct pump before shipment?

Yes. Buyers can send old pump photos, engine nameplate, machine model and visible part number marks. Topvelsun can help compare the information before order confirmation.