861155A3 Aftermarket Mercruiser Boost/Low-Pressure Fuel Pump | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Low-Pressure Electric Boost Pump - Replaces Part Number: 861155A3

New aftermarket low-pressure electric fuel pump replacing 861155A3. It is configured for 4.3L V6 carburetted engines, 5.0L and 5.7L carburetted GM V8 engines using the specified boost pump. The exact engine model, serial range, fuel pressure and connection layout must match the original installation.

⚙️ Key Features

• Direct replacement for the 861155A3 service family

• Designed for MerCruiser carburetted V6 and small-block V8 engines

• Regulated low-pressure electric fuel delivery

• Suitable for carburettor, vapour-separator or boost-pump supply use as specified

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

🧰 Kit / Assembly Contents

• 1 × Complete electric fuel-pump assembly/cartridge - Part Number: 861155A3

• 1 × Integrated electrical connector or terminals

• 1 × Inlet screen/strainer - supplied where included by the selected manufacturer

• Seals, module O-rings and mounting hardware are renewed separately unless included

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 861155A3 (MerCruiser OEM boost-pump reference)

OEM / Related Numbers:

• 861155

Aftermarket / Verified Equivalents:

• Recmar: REC861155A3

• Aftermarket MerCruiser low-pressure boost pump

🚤 Compatibility

Commonly used on:

• MerCruiser carburetted V6 and small-block V8 engines

Typically suits:

• Engine models:

• 4.3L V6 carburetted engines

• 5.0L and 5.7L carburetted GM V8 engines using the specified boost pump

• HP / Output Range: Approximately 175HP - 260HP

• Engine / System Type: MerCruiser carburetted V6 and small-block V8 engines

• Year Range: Model- and serial-dependent

• Serial / Pump Identification: Match P/N 861155A3 to the model-specific parts diagram and verify pressure, electrical connector, inlet/outlet orientation and mounting before ordering.

🔌 Function

The electric low-pressure pump draws fuel from the boat tank and maintains the regulated supply required by the carburettor, vapour separator or high-pressure pump.

Common signs of failure:

• Pump does not run when commanded

• Hard starting or extended cranking

• Low inlet pressure to the high-pressure pump

• Power loss or surging under sustained load

• Excessive pump noise, overheating or intermittent operation

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging