Fuel Feed Pump 129612-52100 for Yanmar Engine 3TNV84 3TNV88 4TNV84 4TNV98 4TNE94 4TNE98 4TNV88 Hitachi Excavator ZX30U-2 ZX35U-2

Fuel Feed Pump 129612-52100 for Yanmar Engine 3TNV84 3TNV88 4TNV84 4TNV98 4TNE94 4TNE98 4TNV88 Hitachi Excavator ZX30U-2 ZX35U-2

This fuel pump is built to meet or exceed the original specs for Yanmar Engine 3TNV84 3TNV88 4TNV84 4TNV98 4TNE94 4TNE98 4TNV88 Hitachi Excavator ZX30U-2 ZX35U-2. 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

129612-52100 • 12961252100 • Engine • Yanmar • 3TNV84 • 3TNV88 • 4TNV84 • 4TNV98 • 4TNE94 • 4TNE98 • 4TNV88

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

Will this fit my Yanmar ZX30U-2?
Yes. This part is designed to fit the Yanmar ZX30U-2, ZX35U-2 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 129612-52100 with 12961252100?
Yes. Both 129612-52100 and 12961252100 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 (ZX30U, ZX35U, ZX17U, ZX33U) 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.

My vehicle is a 9612 model — is it covered?
The compatibility range for this part includes 9612-5210. The 9612 model year falls within this range, but you should still verify the engine code and body type match. Mid-year production changes sometimes mean two vehicles from the same model year use different parts.

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