{"product_id":"volvo-447","title":"Volvo Penta D3 Fuel Delivery Pipe 31251173 | OEM Common Rail Cylinders 3-4","description":"\u003ch2\u003ePart Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 31251173\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Volvo Penta\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e High-Pressure Fuel Delivery Pipe — Cylinders 3 and 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 31303608\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaced By:\u003c\/strong\u003e No current supersession on record\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagram Position:\u003c\/strong\u003e Common-Rail Fuel Injection System — Delivery pipe serving cylinders 3 and 4 (D3 fuel injector \/ delivery pipe assembly, generations D–H)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Volvo Penta 31251173 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 the injectors serving cylinders 3 and 4, and supersedes the earlier reference 31303608. The D3 fuel system uses four position-specific delivery pipes — each precision-formed for a specific routing path and cylinder connection. They are not interchangeable, and high-pressure common-rail pipes must never be reshaped or modified to fit.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVolvo Penta D3-110I (generations D–H)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D3-140A \/ D3-140I (generations D–H)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D3-150I (generations D–H)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D3-170A \/ D3-170I (generations D–H)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D3-200A \/ D3-200I (generations D–H)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D3-220A \/ D3-220I (generations D–H)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eConfirm your complete engine model, generation suffix, and serial number against the Volvo Penta D3 fuel injector and delivery pipe diagram before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eSerial Number Requirements\u003c\/h2\u003e\n\u003cp\u003eThe D3 common-rail system uses several position-specific high-pressure pipes, each formed for a particular injector or pump connection. Always confirm by engine model, generation suffix, and serial number. Do not substitute delivery pipes between cylinder positions.\u003c\/p\u003e\n\n\u003ch2\u003eSystem\u003c\/h2\u003e\n\u003cp\u003eFuel System — Common-Rail High-Pressure Fuel Injection \/ Distribution Rail to Injectors (Cylinders 3 \u0026amp; 4)\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts — D3 Common-Rail Fuel System\u003c\/h2\u003e\n\u003cp\u003eThe following components are part of the D3 fuel injection system and should be inspected during delivery pipe service:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/volvo-penta-d3-fuel-delivery-pipe-31251172\"\u003eDelivery Pipe — 31251172\u003c\/a\u003e (cylinders 1 and 2)\u003c\/li\u003e\n\u003cli\u003eDelivery Pipe — 31251174 (cylinder 5 \/ fuel-pump circuit)\u003c\/li\u003e\n\u003cli\u003eDelivery Pipe — 31251175 (fuel-pump connection)\u003c\/li\u003e\n\u003cli\u003eDistribution Pipe — 30777759\u003c\/li\u003e\n\u003cli\u003ePressure Sensor — 30787950\u003c\/li\u003e\n\u003cli\u003eControl Valve — 31216313\u003c\/li\u003e\n\u003cli\u003eInjector — 3801385\u003c\/li\u003e\n\u003cli\u003eRetaining Clamp — 31272772\u003c\/li\u003e\n\u003cli\u003eO-ring Kit — 31272771\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDimensions \u0026amp; Weight\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approximately 0.5 kg\u003c\/li\u003e\n\u003cli\u003ePipe routing and dimensions are specific to the cylinders 3 and 4 position — confirm via Volvo Penta D3 fuel system diagram\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace the delivery pipe if any of the following apply:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePipe is bent, kinked, or physically damaged\u003c\/li\u003e\n\u003cli\u003eCorrosion or external damage to the pipe body or fittings\u003c\/li\u003e\n\u003cli\u003eLeaking at a high-pressure connection (rail or injector end)\u003c\/li\u003e\n\u003cli\u003eDamaged during injector or fuel rail service\u003c\/li\u003e\n\u003cli\u003eUnable to seal correctly at the fitting after reassembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHigh-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.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eUse 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 and rail fittings for damage before installing the new pipe. Replace the O-ring kit (31272771) at the same time if fittings have been disturbed.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What superseded part number does 31251173 replace?\u003c\/strong\u003e\u003cbr\u003eA: 31251173 supersedes the earlier Volvo Penta reference 31303608. Always order by the current active OEM number to ensure you receive the updated pipe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 31251172, 31251173, 31251174, and 31251175?\u003c\/strong\u003e\u003cbr\u003eA: These are four separate position-specific high-pressure delivery pipes in the D3 common-rail fuel system. 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. They are not interchangeable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I reshape a delivery pipe to make it fit?\u003c\/strong\u003e\u003cbr\u003eA: 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this is the right pipe for my engine?\u003c\/strong\u003e\u003cbr\u003eA: Confirm your engine model, generation suffix (D, E, F, G, or H), and serial number, then cross-reference with the Volvo Penta D3 fuel injector and delivery pipe diagram to verify the cylinders 3-4 position.\u003c\/p\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThe most common issue with D3 delivery pipe orders is customers ordering by engine family without specifying the cylinder position. All four pipes look similar and are close in price, but they are formed to different routing paths and are not interchangeable. The fastest way to confirm the right pipe is to pull up the D3 fuel injector diagram for the specific engine generation and identify the pipe by its cylinder position. It’s also worth noting that 31251173 supersedes 31303608 — if a customer references the old number, this is the current replacement. Recommend the O-ring kit (31272771) at the same time if any fittings are being disturbed.\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43563997921316,"sku":"31251173","price":176.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/fb179c12-fa0a-4769-9b6f-c9b60a214cf6.png?v=1787519752","url":"https:\/\/marisolmarine.com\/products\/volvo-447","provider":"Marisol Marine Company","version":"1.0","type":"link"}