Fuel Injection Pump 511-7975 379-0150 for Caterpillar CAT Engine C9 C9.3 Loader 966K 966M 972K
This fuel pump is engineered as a direct replacement for the Caterpillar CAT Engine C9 C9.3 Loader 966K 966M 972K. 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 C9 C9.3 Loader 966K 966M 972K Replace Part Number: CA3790150, 379 | 0150, 3790150, CA5117975, 511-7975, 5117975 Fit For |
| CAT Engine: C9, C9.3 Application:Fit For | See product specifications |
| CAT Motor Grader: 140, 140 AWD, 12M, 12M 2, 12M 3, 12M 3 AWD, 140M, 140M 2, 140M 3, 140M 3 AWD, 160M, 160M 2, 160M 3, 160M 3 AWDFit For | See product specifications |
| CAT Tractor: 2864C, 568C, 627H, 627K, 627K LRC, 637K, D6T, D6T LGP, D6T LGP , D6T LGPPAT, D6T XL, D6T XW, D7E, D7E LGPFit For | See product specifications |
| Caterpillar V Excavator: 336E, 336E H, 336E HVG, 336E L, 336E LH, 336E LN, 336E LNH, 336F, 336F L, 336F LN, 336F LXE, 336F XE, 340F, 568 FM LLFit For | See product specifications |
| CAT Truck: 725C, 725C2Fit For | See product specifications |
| CAT Loader: 966K, 966L, 966M, 966M XE, 972K, 972L, 972M, 972M XE, 973KFit For | See product specifications |
| CAT Cold Planer: PM310, PM312, PM313 | See product specifications |
Replaces OEM Part Numbers
CA3790150 • 379-0150 • 3790150 • CA5117975 • 511-7975 • 5117975 • Caterpillar • Engine • Application • Motor • Grader • AWDFit
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 966K?
Yes. This part is designed to fit the Caterpillar 966K, 966M, 972K 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 CA3790150 with 379-0150?
Yes. Both CA3790150 and 379-0150 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 (PM310, PM312, PM313) 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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