2003 Jaguar S-Type Fuel Pump Replacement: A Complete Guide
The bottom line: The fuel pump on a 2003 Jaguar S-Type is located inside the fuel tank, accessed by removing the rear seat cushion and the fuel pump access panel underneath. Replacing it is a moderate to difficult job that requires specific tools, safety precautions, and an understanding of the vehicle's dual-pump system. The replacement cost typically ranges from $300 to $800 for parts and labor, depending on your location and whether you choose a shop or dealer service. This guide covers everything you need to know about locating, diagnosing, and replacing the fuel pump on your 2003 Jaguar S-Type.
Where Is the Fuel Pump Located on a 2003 Jaguar S-Type?
The fuel pump on a 2003 Jaguar S-Type is located inside the fuel tank, which sits beneath the rear seat area of the vehicle. This is a common design in modern vehicles, as submerging the pump in fuel helps keep it cool and reduces the risk of vapor lock. The S-Type actually uses two fuel pumps – one on the right side of the fuel tank (Fuel Pump No. 1) and one on the left side (Fuel Pump No. 2). The left-side pump is often referred to as the transfer pump, while the right-side pump is the main fuel delivery pump.
To access the fuel pump module, you must remove the rear seat cushion and then the metal access panel that covers the top of the fuel tank. This is a significant difference from older vehicles that had external fuel pumps mounted on the frame or engine.
Symptoms of a Failing Fuel Pump in a 2003 Jaguar S-Type
Before you start tearing into the car, it helps to know what signs point to a bad fuel pump. Common symptoms include:
- Engine won't start or cranks but doesn't fire – This is the most obvious sign. If the pump isn't delivering fuel, the engine simply won't run.
- "Fuel Data Error" message on the dashboard – This error is often triggered when the fuel pump or transfer pump stops working.
- Stalling unexpectedly – The car may run fine for a while, then suddenly die, especially under load or going uphill.
- Whirring or humming noise from the rear of the car – A failing fuel pump often makes a loud, audible sound before it completely fails.
- Poor engine performance – The engine may hesitate, surge, or lack power during acceleration.
- Check engine light is on – A slow failure of the fuel pump can cause the engine to run lean, triggering the check engine light.
If you notice any of these symptoms, it's wise to diagnose the issue quickly. A failed fuel pump can leave you stranded.
How to Diagnose the Fuel Pump on a 2003 Jaguar S-Type
Before replacing the pump, you should verify that it's actually the problem. Here are some diagnostic steps:
Check the fuses and relays first. The fuel pump relay and fuse are located in the front power distribution fuse box (right front of the engine compartment). The relay is labeled "Fuel pump relay," and the fuses include Fuse F23 (30A) and Fuse F19 (10A) for the fuel pump circuit. A blown fuse or faulty relay can cause the same symptoms as a bad pump, and it's a much cheaper fix.
Listen for the pump. When you turn the key to the "ON" position (without starting the engine), you should hear a faint whirring sound from the rear of the car for about 2 seconds. This is the fuel pump priming the system. If you hear nothing, the pump may not be receiving power, or it may be dead.
Check for the "Fuel Data Error" message. On the 2003 S-Type, this error message is a strong indicator that the fuel pump or transfer pump is not working properly. It's a common complaint among S-Type owners and points directly to the fuel delivery system.
Test fuel pressure. A mechanic can connect a fuel pressure gauge to the fuel rail to check if the pump is delivering the correct pressure. The 2003 S-Type requires a specific pressure range, and if it's below spec, the pump is likely failing.
How to Replace the Fuel Pump on a 2003 Jaguar S-Type
Replacing the fuel pump on a 2003 Jaguar S-Type is a job that many DIYers can handle, but it requires patience and the right approach. The general steps are as follows:
Step 1: Prepare the vehicle. First, relieve the fuel system pressure. You can do this by locating the fuel pressure relief valve (usually near the fuel rail) and using a pressure relief tool. Then, disconnect the negative battery terminal. This is a critical safety step to prevent sparks. Work in a well-ventilated area, away from any open flames or ignition sources, because fuel vapors are highly flammable.
Step 2: Remove the rear seat. The rear seat cushion is held in place by clips or bolts near the front edge of the seat where it meets the floor. Push, pull, or unbolt these fasteners to release the seat. Once the seat cushion is removed, you will see a metal access panel covering the top of the fuel tank.
Step 3: Access the fuel pump assembly. Remove the screws or bolts holding the access panel in place. Lift the panel away to reveal the top of the fuel tank and the fuel pump module. You will see electrical connectors, fuel lines, and the locking ring that secures the pump assembly.
Step 4: Disconnect everything. Carefully disconnect the electrical connectors from the pump module. Then, disconnect the fuel lines. Residual fuel pressure may still be present, so have a rag handy to catch any fuel spray. Use the correct fuel line disconnect tools to avoid damaging the quick-connect fittings.
Step 5: Remove the pump assembly. The fuel pump module is secured to the tank with a locking ring. You may need a specialized tool, such as a fuel pump module removal tool or a large spanner wrench, to turn the locking ring counterclockwise and remove it. Once the ring is off, carefully lift the pump assembly out of the tank. Be mindful of the fuel level; if the tank is full, it will be heavy and messy. Ideally, have a near-empty tank before starting this job.
Step 6: Replace the pump or the entire module. You have two options here. You can replace just the pump itself (the electric motor inside the module), or you can replace the entire fuel pump module assembly. Replacing the entire assembly is easier and more reliable, as it includes the pump, strainer, fuel level sender, and all necessary seals. The 2003 S-Type uses a Pierburg 7.28177.013 pump for the main and transfer units. If you choose to replace just the pump, you can disassemble the module, remove the old pump, and install the new one. The entire assembly part number for the left side (with supercharger) is XR849201, and the right side assembly is often referenced as E8577M, FG1712, or P76604M.
Step 7: Install the new pump or module. Place the new pump or module assembly into the tank, making sure it sits properly. Install the new locking ring (if provided) and tighten it securely. Reconnect the fuel lines and electrical connectors. Make sure all connections are tight and secure.
Step 8: Test the system. Before reinstalling the seat, reconnect the battery and turn the key to the "ON" position. Listen for the pump to prime. Check for any fuel leaks around the connections. If everything looks good, start the engine and let it run for a few minutes, checking for leaks again. Once you're confident the system is working properly, reinstall the access panel and the rear seat cushion.
Cost of Replacing the Fuel Pump on a 2003 Jaguar S-Type
The cost to replace the fuel pump on a 2003 Jaguar S-Type varies depending on where you get the work done and whether you do it yourself or hire a professional.
DIY cost: If you do the work yourself, the cost is primarily the parts. A new fuel pump module assembly for the 2003 S-Type typically costs between $80 and $150 for an aftermarket unit, depending on the brand and whether it's a complete module or just the pump. Genuine Jaguar parts can be significantly more expensive, with the entire assembly costing around $700 or more.
Professional mechanic cost: If you hire a mobile mechanic, the average cost for a fuel pump replacement on a 2003 Jaguar S-Type is around $644, with $364 for parts and $280 for labor. However, at a dealership or traditional repair shop, the cost can be much higher, ranging from $2,605 to $4,886. This wide range is due to the labor-intensive nature of the job and the higher markup on parts at dealerships.
Important note: The 2003 S-Type has two fuel pumps. If one fails, it's often recommended to replace both at the same time, especially if you have to drop the tank or open the access panel. This adds to the cost but ensures long-term reliability.
Special Considerations for the 2003 Jaguar S-Type
The 2003 Jaguar S-Type has some unique features that affect the fuel pump replacement process:
The dual-pump system. As mentioned earlier, the S-Type has two fuel pumps – one on each side of the fuel tank. The left-side pump (part number XR849201) is often called the transfer pump, and it moves fuel from the left side of the tank to the right side, where the main pump sits. If you get a "Fuel Data Error" message, it's often the transfer pump that has failed, not the main pump. Some owners have reported that the main pump (right side) is more readily available, but the left-side transfer pump can be harder to find.
The supercharged model (S-Type R). If you own a 2003 Jaguar S-Type R (supercharged 4.2L V8), the fuel pump requirements are slightly different. The left-side pump for the supercharged model is the Pierburg 7.28177.013, and the entire assembly can be expensive and hard to source. Some owners have reported waiting weeks for a replacement pump from dealers in Europe.
The fuel level sender. The fuel pump module also includes the fuel level sending unit. If you're having issues with your fuel gauge reading incorrectly, the problem may be the sender unit, not the pump itself. The part number for the left-side fuel sender unit is XR849201, and it's used on 2003-2005 S-Type models.
Tools You'll Need for the Job
If you decide to tackle this replacement yourself, you'll need the following tools:
- Socket set and wrenches (metric and standard)
- Fuel line disconnect tools (for quick-connect fittings)
- Fuel pump module removal tool (or a large spanner wrench for the locking ring)
- Safety equipment: safety glasses, gloves, and a fire extinguisher
- A rag or shop towels for fuel spills
- A fuel pressure releif tool (if you have one)
- Jack stands and a floor jack (if you need to lower the fuel tank)
The job is rated as "moderate to difficult" and is not recommended for inexperienced DIYers. If you're not comfortable working with fuel systems, it's better to hire a professional mechanic.
Why You Should Consider KEMSO Fuel Pumps for Your 2003 Jaguar S-Type
When it comes to replacing the fuel pump on your 2003 Jaguar S-Type, you want a product that offers reliability, performance, and peace of mind. That's where KEMSO comes in. KEMSO fuel pumps are designed as high-performance, OEM replacement parts that meet or exceed the original specifications of your vehicle. Whether you need a pump for the main fuel delivery or the transfer pump, KEMSO provides a direct fit that simplifies the installation process.
What sets KEMSO apart is their commitment to quality and durability. Each fuel pump is engineered to deliver consistent fuel flow, reduce noise, and withstand the demands of daily driving. But the best part? KEMSO fuel pumps come with a lifetime warranty. This means you can install their product with confidence, knowing that if anything goes wrong, you're covered for the life of the pump. No questions asked – just reliable performance backed by a promise.
If you're ready to replace the fuel pump on your 2003 Jaguar S-Type, visit KEMSO's website to find the right pump for your vehicle:
KEMSO offers a wide range of fuel pumps for various vehicles, and their customer service team is ready to help you find the exact part you need. With a lifetime warranty and high-quality construction, KEMSO is the smart choice for your Jaguar S-Type fuel pump replacement.
Final Thoughts
Replacing the fuel pump on a 2003 Jaguar S-Type is not a simple job, but it is manageable with the right tools, safety precautions, and a clear understanding of the process. The pump is located inside the fuel tank under the rear seat, and the vehicle uses a dual-pump system that requires attention to both the main and transfer pumps. Symptoms like a no-start condition, "Fuel Data Error" message, or unusual noises from the rear of the car are clear indicators that the pump needs attention.
The cost of replacement ranges from about $300 for a DIY job to over $2,600 at a dealership, so it pays to shop around and consider doing the work yourself if you have the skills. Always prioritize safety by relieving fuel pressure, disconnecting the battery, and working in a well-ventilated area.
For a reliable, high-quality replacement, consider KEMSO fuel pumps. With their OEM-level performance and lifetime warranty, you can get your Jaguar back on the road with confidence. Visit https://www.kemsoracing.com/ to learn more and find the right fuel pump for your 2003 Jaguar S-Type.