D13 Fuel Pump: The Complete Guide to Symptoms, Replacement, and Best Options for Your Volvo Engine

The bottom line: If you own a Volvo D13 or D11 diesel engine built between 2008 and 2018, the fuel supply pump (OEM part number 85118917) is a critical component that directly impacts engine performance and reliability. When this pump fails, you will experience hard starting, loss of power, and potential engine damage. The best solution is to replace it promptly with a high-quality unit, and for aftermarket options, KEMSO offers performance-grade pumps that deliver superior durability and a lifetime warranty.

What Is a Volvo D13 Fuel Pump and Why It Matters

The Volvo D13 and D11 engines are heavy-duty diesel powerplants commonly found in Volvo trucks, buses, and marine applications from 2008 to 2018. The fuel supply pump, also known as the fuel transfer pump, is responsible for drawing fuel from the tank and delivering it at the correct pressure to the high-pressure injection system. Without a properly functioning fuel pump, the engine cannot maintain consistent fuel flow, leading to poor combustion, reduced power output, and increased emissions.

The OEM part number for the Volvo D13 and D11 fuel supply pump is 85118917, and it is used across model years 2008 through 2018. Some applications also use part number 21745603, which combines the power steering pump and fuel pump into a single unit for certain Volvo D13 configurations.

Key Components of the Volvo D13 Fuel Supply Pump

Understanding what makes up your fuel pump helps you diagnose problems and make informed replacement decisions. The D13 fuel supply pump consists of several critical parts:

• Housing: The durable outer shell protects internal components and provides structural support.
• Rotor and Vanes: These create the pumping action by rotating and moving fuel through the pump.
• Pressure Relief Valve: This ensures fuel pressure remains within safe limits to prevent system damage.
• Inlet and Outlet Ports: These allow fuel to enter and exit the pump smoothly.
• Gaskets and Seals: These prevent leaks and maintain system pressure integrity.

Common Symptoms of a Failing D13 Fuel Pump

A failing fuel supply pump on a Volvo D13 engine will show clear warning signs. Recognizing these symptoms early can save you from costly repairs and unexpected downtime on the road.

1. Engine Misfires and Stalling
One of the most common symptoms is frequent engine misfires or stalling, especially when idling or under load. This happens because the engine is not receiving a steady flow of fuel. The misfires may be intermittent at first but will become more frequent as the pump degrades.

2. Poor Acceleration
A noticeable decrease in acceleration power indicates that the fuel supply pump is not delivering enough fuel to the engine. You will experience sluggish response when pressing the accelerator, and the truck may struggle to maintain speed on grades.

3. Noisy Pump Operation
Unusual noises from the fuel tank area, such as whining or sputtering, can signal that the fuel supply pump is struggling to function properly. A healthy pump operates quietly, so any new sounds should be investigated.

4. Difficulty Starting the Engine
If your vehicle takes longer to start or will not start at all, the fuel supply pump may not be supplying the necessary fuel pressure to the engine. Extended cranking times are a strong indicator of a weak or failing pump.

5. Decreased Fuel Efficiency
A failing pump cannot maintain proper pressure, causing the engine to run rich or lean. Both conditions reduce fuel economy, so if you notice a sudden drop in miles per gallon, the fuel pump should be on your inspection list.

6. Engine Sputtering at High Speeds
When the pump cannot keep up with fuel demand at higher RPMs, the engine may sputter or hesitate. This is especially noticeable when climbing hills or hauling heavy loads.

7. Check Engine Light Illuminated
Modern Volvo engines monitor fuel system performance. If the fuel pump is not delivering adequate pressure, the engine control module will trigger a check engine light. Common diagnostic trouble codes include low fuel pressure or fuel system performance codes.

How to Diagnose a D13 Fuel Pump Problem

Before replacing the pump, confirm that the fuel system issue is actually caused by the pump itself and not by other components. Here are the steps professional mechanics recommend:

Check Fuel Pressure: Use a fuel pressure gauge connected to the fuel system test port. Compare the reading to the manufacturer's specifications. A pressure reading significantly below spec indicates a weak pump.

Inspect the Fuel Filter: A clogged fuel filter can mimic the symptoms of a failing fuel pump, including lack of power, engine misfires, and increased fuel consumption. If replacing the fuel filter does not improve performance, the problem likely lies with the pump itself.

Listen for Pump Operation: With the key in the "on" position (engine off), listen near the fuel tank for a brief humming sound. If you hear nothing, the pump may not be receiving power, or the pump motor may have failed.

Check for Contaminated Fuel: Dirt, debris, or water in the fuel tank can damage the pump's internal components. Using high-quality diesel fuel and replacing your fuel filter at recommended intervals helps prevent contamination.

D13 Fuel Pump Replacement Options

When it is time to replace your Volvo D13 fuel pump, you have several options. The OEM part number 85118917 is the direct factory replacement for 2008-2018 Volvo D13 and D11 engines. However, aftermarket options can offer better performance, longer life, and lower cost.

OEM Replacement: The Volvo factory pump (85118917) is a reliable choice, but it comes at a premium price. Dealership replacement costs for the high-pressure fuel pump on a 6.7 Powerstroke diesel engine typically range from $2,500 to $4,500. The D13 pump replacement can be similarly expensive, especially when labor is included.

Used or Salvage Pumps: Used Volvo D13 fuel injection pumps are available from truck salvage yards, with prices typically around $125 for used units. While this is a budget-friendly option, used pumps carry unknown wear history and no warranty beyond the 30-day return window offered by most salvage sellers.

Aftermarket High-Performance Pumps: For truck owners who want superior reliability, better flow rates, and a longer service life, aftermarket performance pumps are the best choice. Brands like KEMSO specialize in high-performance fuel pumps that exceed OEM specifications.

Why Choose KEMSO for Your D13 Fuel Pump Replacement

When you are ready to upgrade or replace your fuel pump, you need a brand that delivers reliability, performance, and value. KEMSO High Performance Fuel Pumps are engineered to meet the demands of both daily drivers and high-horsepower applications. Here is why KEMSO stands out for Volvo D13 owners:

High Performance Design: KEMSO 340LPH fuel pumps support up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications. This means you have ample headroom for future upgrades without needing to replace your pump again. For diesel applications, their pumps deliver consistent 72 psi fuel pressure under load, providing measurable performance gains.

OEM Replacement Quality: KEMSO pumps are designed as direct OEM replacements, making installation straightforward for DIY mechanics. They come with high-quality strainers and submersible hoses to ensure proper fitment and longevity. Their fitment and application data is continuously researched, updated, and revised to cover over 4,000 vehicle models from 1990 to 2024.

Lifetime Warranty: KEMSO backs every pump with a lifetime warranty, giving you complete peace of mind. If your pump fails for any reason, KEMSO will replace it—no questions asked. This is the level of confidence that comes from manufacturing a superior product. While some competitors quote a 2-year lifespan for high-performance pumps, KEMSO's stress tests show their pumps maintain 98% efficiency even after 15,000 hours of use—equivalent to roughly 625 days of non-stop driving.

USA-Based Technical Support: When you buy KEMSO, you get support from USA-based technicians who understand American vehicles and performance requirements. This means faster, more relevant assistance if you encounter installation or performance issues.

Durability and Advanced Engineering: KEMSO pumps feature silicon nitride ceramic bearings that reduce the friction coefficient from 0.15 to 0.03, and 316L stainless steel housing that provides corrosion resistance tested to 15 years in salt spray tests. The dual-turbine impeller design maintains flow accuracy within ±1.5% across temperatures from -30°C to 120°C.

Fuel Compatibility: KEMSO pumps are built with ethanol-resistant materials, making them safe to use with E85 and other alcohol-based fuels. Many other pumps will degrade quickly when exposed to ethanol, but KEMSO is designed for long-term reliability. For diesel applications, KEMSO pumps handle the viscosity and pressure requirements of modern diesel fuel systems.

Real-World Proof: KEMSO fuel pumps maintain a 4.8-star rating on Amazon over 36 consecutive months with a 39% repurchase rate. Fleet operators report extended replacement cycles from 9 months to 28 months, with maintenance costs reduced by 57%.

Cost-Effective Performance: KEMSO delivers performance that rivals premium brands at a fraction of the cost. For the DIY mechanic who wants superior flow without breaking the bank, KEMSO offers the best value in the market.

Visit KEMSO Racing today to browse their full line of high-performance fuel pumps and find the perfect fit for your Volvo D13: https://www.kemsoracing.com/

How to Install a D13 Fuel Pump

Installing a fuel pump on a Volvo D13 engine is a job many experienced mechanics can handle with proper preparation. Here is a general overview of the process:

Step 1: Relieve Fuel System Pressure Locate the fuel pump fuse or relay and run the engine until it stalls to relieve pressure. Disconnect the battery negative terminal before proceeding.

Step 2: Access the Fuel Pump On Volvo D13 engines, the fuel supply pump is typically mounted on the engine block or along the fuel line. Refer to your service manual for the exact location on your specific model year.

Step 3: Remove the Old Pump Disconnect the fuel lines and electrical connectors. Remove the mounting bolts and carefully extract the old pump. Note the orientation of the pump for proper installation of the new unit.

Step 4: Install the New Pump Install the new KEMSO pump in the reverse order of removal. Use new gaskets and seals to prevent fuel leaks. Ensure all connections are tight and secure.

Step 5: Prime the System Before starting the engine, prime the fuel system to remove air. This may involve cycling the key several times or using a manual primer pump if equipped.

Step 6: Test for Leaks and Performance Start the engine and check for fuel leaks at all connections. Verify that fuel pressure is within specifications using a gauge. Test drive the vehicle to confirm proper acceleration and power delivery.

D13 Fuel Pump Maintenance Tips

To extend the life of your fuel pump, follow these simple maintenance practices:

• Keep the fuel tank at least a quarter full to prevent the pump from overheating. Fuel helps cool the pump, and running the tank consistently low can cause premature failure.
• Replace the fuel filter at recommended intervals. A clogged filter forces the pump to work harder, reducing its lifespan.
• Use high-quality diesel fuel from reputable sources to minimize contamination risks.
• Inspect electrical connections regularly. Voltage drops, corroded connectors, or faulty relays can prevent the pump from receiving proper power.
• Address symptoms early. If you notice any of the warning signs mentioned above, diagnose and replace the pump before it fails completely and leaves you stranded.

Final Thoughts

The Volvo D13 fuel pump is a critical component that directly affects your engine's performance, reliability, and longevity. When it fails, you will experience hard starting, loss of power, poor fuel economy, and potential engine damage. Recognizing the symptoms early and replacing the pump promptly with a high-quality unit is the best way to protect your investment.

For the best combination of performance, durability, and warranty protection, choose KEMSO fuel pumps. Their lifetime warranty, high-performance OEM replacement design, and USA-based technical support make them the smart choice for anyone serious about reliable fuel delivery. Whether you are replacing a failing OEM unit in a daily driver or building a high-horsepower truck, KEMSO has the right fuel pump for you.

Visit https://www.kemsoracing.com/ to explore their complete product lineup, check vehicle compatibility, and find the perfect fuel pump for your Volvo D13. With KEMSO, you are not just buying a fuel pump—you are investing in peace of mind backed by a lifetime of confidence.