{"product_id":"volvo-446","title":"Volvo Penta D3 Fuel Delivery Pipe 31251172 | OEM Common Rail Cylinders 1-2","description":"\u003ch2\u003ePart Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 31251172\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 1 and 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e No supersession on record\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 1 and 2 (D3 fuel injector \/ delivery pipe assembly)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Volvo Penta 31251172 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 1 and 2. The D3 fuel system uses four position-specific delivery pipes — each formed to fit a precise routing path — so matching the exact OEM part number to the correct cylinder connection is essential. 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 fuel system uses several different formed delivery pipes, each specific to a cylinder position or pump connection. Always confirm by engine model, generation suffix, and serial number. Do not substitute delivery pipes between positions — each pipe is formed to a specific routing path and connection geometry.\u003c\/p\u003e\n\n\u003ch2\u003eSystem\u003c\/h2\u003e\n\u003cp\u003eFuel System — Common-Rail High-Pressure Fuel Injection \/ Distribution Rail to Injectors\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\u003eDelivery Pipe — 31251173 (cylinders 3 and 4)\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\u003eFuel Hose — 31321198\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 1 and 2 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.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\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 — each is formed to a specific routing path.\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 high-pressure fuel system operating conditions.\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 cylinder 1-2 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 delivery pipes in this system 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 reminding customers that high-pressure fuel pipes should never be reused if they’ve been bent or damaged — even a small deformation at a fitting can prevent a proper seal under operating pressure.\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43563997855780,"sku":"31251172","price":176.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/812a5bf5-aeb2-40ee-85ed-5967c19b1d12.png?v=1787514120","url":"https:\/\/marisolmarine.com\/products\/volvo-446","provider":"Marisol Marine Company","version":"1.0","type":"link"}