Fuel Transfer Pump 4983585 3966156 3970882 for Cummins Engine 4B4.5 ISB4.5

Fuel Transfer Pump 4983585 3966156 3970882 for Cummins Engine 4B4.5 ISB4.5

This fuel pump is built to meet or exceed the original specs for Cummins Engine 4B4.5 ISB4.5. The fuel pump is the heart of the fuel delivery system — it moves fuel from the tank to the engine at the correct pressure and flow rate. A failing pump doesn’t usually give much warning before it leaves you stranded.

Vehicle Compatibility

Replaces OEM Part Numbers

4983585 • 3966156 • 3970882 • 6731-72-1720 • 6731721720 • Cummins • Engine • 4B3.9 • 6C8.3 • CM2150 • ISB6.7 • CM2350

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the fuel pump may be the cause:

• Engine cranks but won’t start — no fuel reaching the injectors
• Stalling under load — engine dies when you demand more power
• Loss of power at high RPM — fuel delivery drops off at higher engine speeds
• Whining noise from fuel tank area — the pump bearings are wearing out
• Engine surging or bucking — inconsistent fuel pressure causes hesitation
• Hard starting after sitting — fuel drains back through a weak check valve

Before You Replace the Pump

Before replacing the fuel pump, check the fuel filter first — a clogged filter causes the same symptoms and costs a fraction of the price. If you confirm the pump is bad, replace the fuel filter at the same time. A restricted filter is often what killed the old pump. After installation, cycle the key to ON several times (without starting) to prime the system and bleed out any air before cranking the engine.

Frequently Asked Questions

Which Cummins models does this part fit?
Refer to the Vehicle Compatibility table above for the full list of Cummins models. Each listing includes the body type, engine, and production years. Match your vehicle’s engine code (stamped on the engine block) against the listed codes to confirm.

Can I cross-reference 4983585 with 3966156?
Yes. Both 4983585 and 3966156 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions. This replacement fits all applications listed for either number.

How do I check if my engine code (CM550, WB142, WB146, WB156) matches?
The engine code is stamped on a metal tag attached to the engine block, usually near the timing belt cover or on the cylinder head. Compare the code you find with the list above. Engine codes are 3 to 6 characters long and use a combination of letters and numbers.

How long does a Cummins fuel pump typically last?
Fuel pump life varies by application, but on Cummins equipment you can generally expect 5,000 to 10,000 hours of operation. Running the tank dry, using contaminated fuel, or neglecting the fuel filter are the top causes of premature failure. If your machine has over 5,000 hours and the fuel filter hasn’t been changed regularly, the pump is likely on borrowed time.

You May Also Need