Fuel Transfer Pump
Home << Products << Engine System << Fuel System << Fuel Transfer Pump << YM129100-52100 Fuel Lift Pump for Yanmar 3TNE84 4TNE84 Komatsu 3D84 4D84Ref Cross: YM129100-52100, YM129100-52101
MOQ: 1 Piece
Warranty: 6 Months
Lead Time: 7 - 15 Days
Part Name: Fuel Lift Pump, Fuel Feed Pump, Mechanical Fuel Pump
Compatible: Yanmar 3TNE84 3TNE88 4TNE84 4TNE88 3TNV76 2TNV70, Komatsu 3D84 4D84 3D88 4D88
Product Description
The YM129100-52100 fuel lift pump is a mechanical low-pressure fuel supply pump for Yanmar and Komatsu small diesel engine applications. It is commonly searched as a fuel lift pump, fuel feed pump or mechanical fuel pump for Yanmar 3TNE84 4TNE84 4TNE88 and Komatsu 3D84 4D84 3D88 4D88 engine references.
This page should focus on YM129100-52100 and 129100-52100. Related references such as YM129100-52101 and 129100-52101 can be kept as Ref Cross numbers, but final fitment should be verified by old pump shape, mounting face, inlet outlet direction and engine model before ordering.
| Main Part Number | YM129100-52100 |
| Ref Cross | 129100-52100 129100-52101 12910052100 12910052101, verify by old pump |
| Part Name | Fuel lift pump, fuel feed pump, mechanical fuel pump |
| Pump Type | Low-pressure mechanical fuel supply pump |
| Application | Yanmar and Komatsu small diesel engine fuel supply applications |
| Compatible | Yanmar 3TNE84 3TNE88 4TNE84 4TNE88 3TNV76 2TNV70, Komatsu 3D84 4D84 3D88 4D88. |
| Fuel Line Reference | Common market listings describe this pump with 8 mm inlet and 8 mm outlet connections |
| Verification Requirement | Confirm old pump number, mounting face, gasket shape, inlet outlet direction, hose size and engine model |
The YM129100-52100 pump is used in the low-pressure fuel supply side of the engine. Its job is to help feed diesel from the tank side toward the injection pump, not to create high-pressure injection. For this reason, it should be listed under Fuel Transfer Pump or Fuel Lift Pump, not Fuel Injection Pump.
This part is often searched for compact excavators, small wheel loaders, skid steers, generators, marine auxiliary engines and industrial machines using Yanmar TNE, TNV or Komatsu D84-series engine references.
Because these engines appear in different machine brands and replacement markets, the old pump sample is more reliable than the machine model alone.
| Symptom | Inspection Point |
| Hard starting | Check pump priming ability, fuel filter condition, suction hose leakage and air in the fuel line |
| Engine stalls after running | Inspect fuel tank pickup, blocked line, weak pump output and filter restriction |
| Power loss under load | Check fuel delivery volume, diaphragm condition, inlet outlet flow direction and fuel line blockage |
| Fuel leakage near pump | Inspect gasket, pump body, hose clamps, fittings and mounting surface |
| Air bubbles in fuel line | Check suction-side hose cracks, loose fittings, filter head sealing and pump connection points |
Before ordering YM129100-52100, compare the old pump number, mounting holes, gasket shape, fuel inlet direction, fuel outlet direction and hose connection size. A similar-looking Yanmar fuel pump may still use a different mounting face or fuel line layout.
If the old pump label shows 129100-52100 or 129100-52101, it can be checked within the same fuel lift pump reference group, but physical comparison is still recommended before shipment.
For remote orders, provide photos of the old pump from the top, side, mounting face, inlet outlet fittings and any visible number mark. Also provide the engine model and machine model if available.
Clean the mounting surface before installation. Old gasket material, dirt or uneven contact can cause fuel leakage or air entry into the fuel supply system.
Check inlet and outlet direction before connecting the fuel hoses. Reversed flow direction can cause no-start, weak fuel delivery or unstable engine operation.
Inspect the fuel filter and fuel hoses during pump replacement. A blocked filter or cracked suction hose can make a new pump appear weak even when the pump is functioning correctly.
After installation, prime the fuel system, remove air from the fuel line, check for leakage and test engine starting, idle stability and response under load.
Topvelsun supplies replacement fuel system parts for compact excavators, small construction machinery, generators, industrial engines and diesel engine repair. For YM129100-52100 orders, we help buyers compare old pump photos, reference numbers, engine model and fuel line layout before shipment.
This product is suitable for repair workshops, fleet maintenance teams, diesel engine rebuilders, compact equipment parts distributors and overseas buyers working on Yanmar or Komatsu small diesel engine fuel supply repair.
It is more accurately called a fuel lift pump or fuel feed pump. It belongs in the Fuel Transfer Pump category because it is part of the low-pressure fuel supply system.
No. YM129100-52100 is generally listed as a mechanical low-pressure fuel lift pump. Do not confuse it with 12V or 24V electric fuel pumps such as 129612-52100.
Common references include Yanmar 3TNE84, 3TNE88, 4TNE84, 4TNE88, 3TNV76, 2TNV70 and Komatsu 3D84, 4D84, 3D88 and 4D88 engine applications. Final fitment should be verified by the old pump and engine information.
Yes. They can stay as Ref Cross numbers for checking. The old pump shape, mounting face and fuel line direction should still be compared before ordering.
Check the old pump number, mounting holes, gasket shape, inlet outlet direction, hose size, engine model and machine model. Clear photos of the old pump are recommended.
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