Fuel Injection Pump 2W-0256 for Caterpillar CAT Engine 3306B 3306T Excavator 235 EL300B Loader 973LGP 973 966D
This fuel pump is engineered as a direct replacement for the Caterpillar CAT Engine 3306B 3306T Excavator 235 EL300B Loader 973LGP 973 966D. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.
Vehicle Compatibility
| Application | Details |
|---|---|
| Caterpillar | See product specifications |
| CAT Engine 3306B 3306T Excavator 235 EL300B Loader 973LGP 973 966D Replacement Part Number: 2W | 0256, 2W0256, CA2W0256 Fit For |
| Caterpillar Engine: 3306, 3306B, 3306T Applications:Fit For Following Models | See product specifications |
| Caterpillar Motor Grader: 140G, 14G, 160G | See product specifications |
| Caterpillar Loader: 973 LGP, 973, 966D, 966F | See product specifications |
| Caterpillar Excavator: 235, 235B, E300B, EL300B | See product specifications |
| Caterpillar Dozer: D7G, D5E | See product specifications |
| Caterpillar Scraper: 627B, 627E, 637E | See product specifications |
| Caterpillar Compactor: 814B, 816B, 815B | See product specifications |
Replaces OEM Part Numbers
2W-0256 • 2W0256 • CA2W0256 • Caterpillar • Engine • 3306B • 3306T
Signs You Need a Replacement
If your equipment is showing any of these symptoms, the injection pump may be the cause:
- Engine cranks but won’t start — The pump may have lost prime or stopped delivering fuel. Check for fuel at the filter outlet before replacing the pump.
- Stalling under load — A weak pump can’t maintain pressure at high demand. The engine runs fine at idle but dies when you put it to work.
- Fuel pressure warning (if equipped) — Modern Caterpillar equipment monitors fuel rail pressure. A low-pressure warning often means the pump is failing.
- Loud whining from fuel system — A failing pump makes a high-pitched whine that gets louder as it warms up. Normal pump noise is a low hum.
- Air in fuel lines — If you see bubbles in the transparent fuel line or the primer bulb won’t stay firm, the pump may be drawing air through a worn seal.
- Excessive return flow — Too much fuel returning to the tank instead of reaching the injectors indicates internal pump wear.
Before You Replace the Pump
Before replacing the pump, check the fuel filter and fuel lines for restrictions. A blocked filter causes the same symptoms as a failing pump on Caterpillar equipment. When installing the new pump, fill it with clean fuel before connecting the lines — this reduces priming time and prevents dry-run damage. After installation, bleed the system fully and check for leaks at all connection points. Replace the fuel filter at the same time as the pump to protect the new unit from debris.
Frequently Asked Questions
Will this fit my Caterpillar 3306B?
Yes. This part is designed to fit the Caterpillar 3306B, 3306T, 235, EL300B among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.
Can I cross-reference 2W-0256 with 2W0256?
Yes. Both 2W-0256 and 2W0256 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.
How do I check if my engine code (EL300B) 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.
How long does a Caterpillar fuel pump typically last?
Fuel pump life varies by application, but on Caterpillar 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.
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