Volvo Penta D3 Fuel Delivery Pipe 31251174 | OEM Common Rail Cylinder 5 & Fuel Pump

Part Information

• Part Number: 31251174
• Brand: Volvo Penta
• Official Product Type: High-Pressure Fuel Delivery Pipe — Cylinder 5 / Fuel Pump
• Supersedes: 31303609
• Replaced By: No current supersession on record
• Diagram Position: Common-Rail Fuel Injection System — Delivery pipe serving cylinder 5 and the fuel pump (D3 fuel injector / delivery pipe assembly, generations D–H)

Overview

The Volvo Penta 31251174 is a genuine OEM high-pressure fuel delivery pipe for the common-rail fuel injection system on Volvo Penta D3 marine diesel engines. It connects the distribution rail to cylinder 5 and the fuel pump, and supersedes the earlier reference 31303609. The D3 fuel system uses four position-specific delivery pipes — each precision-formed for a specific routing path and connection. They are not interchangeable, and high-pressure common-rail pipes must never be reshaped or modified to fit.

Compatible Applications

• Volvo Penta D3-110I-D / E / F / G / H
• Volvo Penta D3-140A-D / E / F / G / H
• Volvo Penta D3-140I-D / E / F / G / H
• Volvo Penta D3-150I-D / E / F / G / H
• Volvo Penta D3-170A-D / E / F / G / H
• Volvo Penta D3-170I-D / E / F / G / H
• Volvo Penta D3-200A-D / E / F / G / H
• Volvo Penta D3-200I-D / E / F / G / H
• Volvo Penta D3-220A-D / E / F / G / H
• Volvo Penta D3-220I-D / E / F / G / H

Confirm your complete engine model, generation suffix, and serial number against the Volvo Penta D3 fuel injector and delivery pipe diagram before ordering.

Serial Number Requirements

The D3 common-rail system uses multiple position-specific high-pressure pipes, each formed for a particular injector or fuel-pump connection. Always confirm by engine model, generation suffix, and serial number. Do not substitute delivery pipes between positions.

System

Fuel System — Common-Rail High-Pressure Fuel Injection / Cylinder 5 & Fuel Pump Connection

Related Parts — D3 Common-Rail Fuel System

The following components are part of the D3 fuel injection system and should be inspected during delivery pipe service:

• Delivery Pipe — 31251172 (cylinders 1 and 2)
• Delivery Pipe — 31251173 (cylinders 3 and 4)
• Delivery Pipe — 31251175 (fuel-pump connection)
• Distribution Pipe — 30777759
• Pressure Sensor — 30787950
• Control Valve — 31216313
• Injector — 3801385
• Retaining Clamp — 31272772
• O-ring Kit — 31272771

Dimensions & Weight

• Weight: Approximately 0.5 kg
• Pipe routing and dimensions are specific to the cylinder 5 / fuel pump position — confirm via Volvo Penta D3 fuel system diagram

When This Part Needs Replacement

Replace the delivery pipe if any of the following apply:

• Pipe is bent, kinked, or physically damaged
• Corrosion or external damage to the pipe body or fittings
• Leaking at a high-pressure connection (rail, injector, or fuel-pump end)
• Damaged during injector, rail, or fuel-pump service
• Unable to seal correctly at the fitting after reassembly

High-pressure common-rail pipes must not be reshaped, bent, or modified to fit. If the pipe is damaged, replace it with the correct OEM part.

Installation Notes

Use the applicable Volvo Penta D3 service procedure for all high-pressure fuel system work. Tighten all fuel connections to the specified torque values — over- or under-tightening high-pressure fittings can cause leaks or fitting damage. Inspect the injector, rail, and fuel-pump fittings for damage before installing the new pipe. Replace the O-ring kit (31272771) at the same time if any fittings have been disturbed.

Technical FAQ

Q: What superseded part number does 31251174 replace?
A: 31251174 supersedes the earlier Volvo Penta reference 31303609. Always order by the current active OEM number to ensure you receive the updated pipe.

Q: What is the difference between 31251174 and 31251175?
A: Both pipes are part of the D3 fuel-pump circuit, but they serve different connection points. 31251174 serves cylinder 5 and the fuel-pump circuit; 31251175 is the separate fuel-pump connection pipe. Confirm the exact position from the D3 fuel system diagram before ordering.

Q: What is the difference between all four D3 delivery pipes?
A: 31251172 serves cylinders 1 and 2, 31251173 serves cylinders 3 and 4, 31251174 serves cylinder 5 and the fuel-pump circuit, and 31251175 is the fuel-pump connection pipe. All four are position-specific and not interchangeable.

Q: Can I reshape a delivery pipe to make it fit?
A: No. High-pressure common-rail fuel pipes must never be bent or reshaped. The pipe geometry is precision-formed for the specific routing path and connection angles. A modified pipe can fail under operating pressure.

Parts Desk Insights

The cylinder 5 / fuel-pump pipe is the one most often confused with 31251175, the separate fuel-pump connection pipe — both are in the same area of the engine and look similar. The diagram is the only reliable way to confirm which one is needed. It’s also worth noting that 31251174 supersedes 31303609 — if a customer references the old number, this is the current replacement. As with all D3 delivery pipe work, recommend the O-ring kit (31272771) at the same time if any fittings are being disturbed.