Fuel injection Pump 129917-51410 104742-7580 for Yanmar Engine 4TNE92
This fuel pump is engineered as a direct replacement for the Yanmar Engine 4TNE92. 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 |
|---|---|
| Precision Fuel Metering for Optimal Power It ensures extremely accurate fuel delivery to each cylinder, resulting in maximum engine power and responsive performance. Enhanced Combustion for Improved Efficiency By delivering fuel at the correct pressure and timing, it promotes cleaner and more complete combustion, which improves fuel economy. Robust Construction for Demanding Applications Manufactured with high | strength materials to withstand intense internal pressures and ensure reliable operation in tough conditions. Consistent High-Pressure Output This pump is engineered to generate and maintain the stable, high pressure required by modern direct injection systems for smooth engine operation. Designed for Direct Fitment and Easy Service Its precise engineering allows for a straightforward installation that integrates seamlessly with the existing engine fuel system |
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 Yanmar 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 Yanmar 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
Which Yanmar models does this part fit?
Refer to the Vehicle Compatibility table above for the full list of Yanmar 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.
How long does a Yanmar fuel pump typically last?
Fuel pump life varies by application, but on Yanmar 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.
What tools do I need to install this on a Yanmar?
Standard metric hand tools will handle most of the job – sockets, wrenches, and a torque wrench. For Yanmar equipment, check the specific service manual for any special tools or torque values.
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