129158-52101 Aftermarket Yanmar Fuel Feed/Lift Pump 2YM, 3YM, 3JH(E), 4JH(E) | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Mechanical Fuel Feed/Lift Pump - Replaces Part Number: 129158-52101

New aftermarket mechanical/pulse-operated fuel pump replacing 129158-52101. It is configured for 2YM15 and 3YM20/3YM30, 3JH2E, 3JH3E and related 3JH naturally aspirated models, 4JH2E, 4JH3E, 4JH4E and related 4JH naturally aspirated models. The exact engine model, serial range, fuel pressure and connection layout must match the original installation.

⚙️ Key Features

• Direct replacement for the 129158-52101 service family

• Designed for Yanmar mechanically injected marine diesel engines

• Pulse- or engine-driven low-pressure fuel delivery

• Marine fuel-resistant diaphragm and valve materials

• Confirm the engine serial, pump pressure and port orientation before installation

🧰 Kit / Assembly Contents

• 1 × Complete mechanical/pulse fuel-pump assembly - Part Number: 129158-52101

• 1 × Integrated diaphragm and check-valve assembly

• 1 × Pump-to-engine mounting gasket - supplied where included by the selected manufacturer

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 129158-52101 (Yanmar OEM reference)

OEM / Related Numbers:

• 12915852101

• 129155-52051 mounting gasket

Aftermarket / Verified Equivalents:

• Recmar: REC129158-52101

• Aftermarket mechanical lift-pump assemblies matching 129158-52101

🚤 Compatibility

Commonly used on:

• Yanmar mechanically injected marine diesel engines

Typically suits:

• Engine models:

• 2YM15 and 3YM20/3YM30

• 3JH2E, 3JH3E and related 3JH naturally aspirated models

• 4JH2E, 4JH3E, 4JH4E and related 4JH naturally aspirated models

• HP / Output Range: Approximately 14HP - 56HP

• Engine / System Type: Yanmar mechanically injected marine diesel engines

• Year Range: YM/3JH/4JH production; serial-dependent

• Serial / Pump Identification: Match P/N 129158-52101 to the model-specific parts diagram and verify pressure, electrical connector, inlet/outlet orientation and mounting before ordering.

🔌 Function

The engine-driven diaphragm pump uses crankcase pulses or a cam-operated lever to draw fuel from the tank and deliver a regulated low-pressure supply to the carburettor, vapour separator or downstream high-pressure pump.

Common signs of failure:

• Hard starting after the engine has been standing

• Fuel starvation, hesitation or loss of power under load

• Failure to fill the carburettor bowls or vapour separator

• Fuel leaking from the pump body or ruptured diaphragm

• Engine-oil dilution or fuel entering the pulse passage on a failed pump

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging