RPS Mechanical Fuel Pump for MerCruiser OMC Volvo Penta 2.5L/3.0L/3.7L - Filter Bowl Down, Gasket Included

RPS Mechanical Fuel Pump is a direct-fit replacement pump for MerCruiser, OMC and Volvo Penta 4‑cylinder marine engines, featuring a downward-facing filter bowl and included gasket for quick installation.

This RPS fuel pump is built to restore proper fuel delivery to GM-based 2.5L, 3.0L and 3.7L marine engines commonly found in MerCruiser, OMC and Volvo Penta applications. It is engineered to match OEM mounting and flow characteristics so it replaces factory units cleanly. The pump accommodates the ‘‘filter bowl down’’ orientation (inlet at 2 o’clock, outlet at 3 o’clock) and ships with a mounting gasket to help ensure a leak-resistant seal. Compatible part numbers include 8M0073435, 861676A1, 3854858 and Sierra 18-7282 among others, making this an easy swap for many boats built on GM inline 4-cylinder blocks from 1982 to present.

How do I confirm this pump will fit my engine?

Confirm fit by checking your engine’s displacement and pump orientation. This RPS pump is intended for GM-based 2.5L (153 CID), 3.0L (181 CID) and 3.7L (224 CID) inline 4-cylinder marine engines and follows OEM mounting bolt locations.

• Verify engine size: 2.5L, 3.0L, or 3.7L inline 4-cylinder.
• Check pump orientation: filter bowl must face downward (inlet at 2 o’clock).
• Compare part numbers: replaces 8M0073435, 861676A1, 3854858, Sierra 18‑7282.
• Match mounting bolt pattern and fuel line ports before installation.

What performance can I expect after installing this pump?

Once installed, the pump is designed to restore correct low-pressure fuel delivery for carbureted marine engines, helping the engine achieve normal starting and idle behavior. It is manufactured with marine-grade components intended to resist corrosion and vibration found in boating environments.

• Designed to deliver typical carburetor fuel pressure (around 6–8 PSI).
• Durable materials resist saltwater and vibration exposure.
• Filter bowl captures sediment before fuel reaches carburetor.
• Gasket included to help prevent leaks at the mounting face.

How difficult is the installation and what comes in the box?

Installation is straightforward for anyone familiar with basic marine engine maintenance: remove the old pump, transfer any mounting hardware as needed, install the RPS pump using the supplied gasket, and reconnect fuel lines according to their inlet/outlet markings. For safety, relieve fuel pressure and work in a well-ventilated area away from ignition sources.

• Includes RPS mechanical fuel pump and a high-quality mounting gasket.
• No additional internal rebuild kit required for most swaps.
• Tools needed: basic hand tools, torque wrench recommended for mounting bolts.
• Verify fuel line routing and clamps during reassembly to prevent leaks.

Who is this pump made for? Boat owners, mechanics, and mariners who operate MerCruiser, OMC or Volvo Penta boats with GM-based 4-cylinder engines and need a reliable, direct-fit replacement will benefit from this RPS mechanical fuel pump. It’s aimed at anyone replacing a failing OEM unit, servicing older craft with carbureted fuel systems, or stocking a dependable spare part for routine maintenance. Always verify engine model, pump orientation, and part number equivalence before purchase to ensure a trouble-free fit and operation.