2001 Jaguar S Type Fuel Pump Relay Location: A Complete Guide for American Owners

The bottom line: The fuel pump relay on a 2001 Jaguar S-Type is located in the engine compartment fuse box, on the driver's side near the battery. This small but critical component controls power delivery to the fuel pump, and knowing exactly where it is and how to test it can save you hundreds of dollars in diagnostic fees and unnecessary repairs. If your S-Type cranks but won't start, the fuel pump relay is one of the first things you should check before replacing the fuel pump itself.

Understanding the Fuel Pump Relay in Your 2001 Jaguar S-Type

The fuel pump relay acts as an electrical switch that sends power to the fuel pump when the engine is cranking or running. When you turn the ignition key to the "ON" position, the relay receives a signal from the engine control module (ECM), closes the circuit, and allows battery voltage to reach the fuel pump. If this relay fails, the fuel pump won't receive power, and the engine will crank but not start.

The relay is located inside the main fuse box under the hood. On the 2001 Jaguar S-Type, this fuse box is positioned on the driver's side of the engine compartment, near the battery and the windshield washer fluid reservoir. The box has a black plastic cover with a diagram on the inside that shows the location of each fuse and relay. The fuel pump relay is typically labeled as "Fuel Pump" or "Fuel Pump Relay" on this diagram. If the diagram is missing or faded, consult your owner's manual for the exact position.

How to Access and Identify the Fuel Pump Relay

To locate the fuel pump relay in your 2001 Jaguar S-Type, follow these steps:

  1. Open the hood and secure it with the prop rod. Make sure the engine is off and the keys are removed from the ignition.

  2. Locate the main fuse box on the driver's side, near the battery. It is a rectangular black box with a clip-on lid. This is the engine compartment fuse box, and it houses both fuses and relays.

  3. Remove the fuse box cover by pressing the tabs on the sides and lifting it off. Set the cover aside where you can see the diagram on the underside.

  4. Look at the diagram on the underside of the cover. The fuel pump relay is usually a larger relay, often labeled with a fuel pump icon or the words "FUEL PUMP." If the diagram is unclear, use a test light or multimeter to identify the relay. The fuel pump relay typically has four or five pins. When the ignition is on, one pin should have 12 volts of power. When the engine is cranking, another pin should briefly show power.

  5. Common relay positions vary slightly by production date, but the fuel pump relay is usually one of the larger relays in the box. Some owners have reported it being the second or third relay from the left in the top row. If you are unsure, you can also check the fuse box located under the dashboard on the driver's side, as the fuel pump relay may also be referenced there.

Symptoms of a Faulty Fuel Pump Relay

A failing fuel pump relay can cause several symptoms that mimic a bad fuel pump or other electrical issues. Recognizing these symptoms can help you narrow down the problem quickly and avoid replacing parts that are still in good working order.

The most common symptom is the engine cranking but not starting. When you turn the key, you should hear a brief whirring sound from the fuel pump located in the gas tank. If you don't hear this sound, the relay may not be sending power to the pump.

Another symptom is the engine starting intermittently. The relay may work when cold but fail when hot, or vice versa. You might also experience the engine stalling while driving, especially after a bumpy road, as the relay's internal contacts may lose connection.

Other symptoms include a check engine light related to fuel system issues, or the engine running rough and then dying. If the relay is completely dead, the fuel pump will not prime, and the car will not start at all. In some cases, you may also notice that the fuel pump runs continuously even after the engine is turned off, which indicates the relay contacts are stuck closed.

Testing the Fuel Pump Relay

Before buying a new relay, you can test the existing one with a few simple tools. This can save you from unnecessary parts replacement and help you confirm the relay is actually the problem.

First, perform a quick sound test. Have someone turn the ignition key to the "ON" position without starting the engine. Listen near the rear of the car for a humming sound from the fuel tank. If you hear it, the relay is likely working. If not, proceed to test the relay itself.

To test the relay with a multimeter:

  1. Remove the fuel pump relay from the fuse box. Pull it straight out, using a gentle rocking motion if it is stuck.

  2. Set your multimeter to measure resistance (ohms). Check the resistance between the relay's coil terminals (usually pins 85 and 86). You should see a reading between 50 and 200 ohms. If the reading is infinite (open circuit), the relay coil is burned out and the relay needs to be replaced.

  3. Apply 12 volts of power to the coil terminals using a battery or power supply. You should hear a click as the relay engages. While power is applied, check the resistance between the switch terminals (usually pins 30 and 87). The reading should drop to near zero ohms, indicating the contacts are closed. If the reading remains infinite, the relay contacts are not making connection and the relay is faulty.

  4. If you don't have a multimeter, you can perform a simple swap test. Locate another relay in the fuse box that is the same type and rating (such as the horn relay or A/C relay). Swap it with the fuel pump relay. If the car starts after the swap, the original fuel pump relay is bad.

What to Do If the Relay Is Good but the Fuel Pump Still Doesn't Work

If you have tested the relay and confirmed it is working properly, but the fuel pump still doesn't prime or the engine won't start, the problem may be elsewhere. Here are the next steps to check:

  1. Check the fuel pump fuse in the same fuse box. A blown fuse will prevent power from reaching the fuel pump even if the relay is working. The fuse is usually labeled "Fuel Pump" or "FP" on the fuse box diagram. Replace it with a new fuse of the same amperage if it is blown.

  2. Check for power at the fuel pump connector. The fuel pump on the 2001 Jaguar S-Type is located inside the fuel tank, accessed through an access panel under the rear seat cushion. You can use a multimeter to check for 12 volts at the pump's electrical connector when the ignition is turned on. If there is power but the pump doesn't run, the fuel pump itself is likely faulty.

  3. Check the fuel pump ground connection. A poor ground can cause the pump to run weakly or not at all. Look for corroded or loose ground wires near the fuel pump or in the trunk area.

  4. Check the inertia switch. Some Jaguar S-Type models are equipped with an inertia fuel shutoff switch that cuts power to the fuel pump in the event of a collision. If this switch is tripped, it will need to be reset. The inertia switch is typically located in the trunk or under the dashboard on the passenger side.

How Much Does It Cost to Replace a Fuel Pump on a 2001 Jaguar S-Type?

The total replacement cost for a fuel pump on a 2001 Jaguar S-Type generally ranges from $400 to $1,000, depending on the model, parts choice, and labor rates. Higher-end models, dealership service, or complex labor can push the price higher. You can save $200 to $700 by doing the job yourself.

The price of a fuel pump itself for the Jaguar S-Type can range from as low as $14.53 to over $300, depending on whether you choose an OEM part or an aftermarket replacement. A quality aftermarket fuel pump, such as one from KEMSO, offers excellent performance and reliability at a fraction of the cost of dealer parts.

Why Choose KEMSO for Your Jaguar Fuel Pump Replacement

When it comes time to replace your fuel pump, choosing the right brand is critical for performance, reliability, and peace of mind. KEMSO fuel pumps are an excellent choice for any vehicle owner, whether you drive a daily commuter, a performance car, or an off-road vehicle.

KEMSO fuel pumps are designed as high-performance OEM replacements. Each KEMSO pump delivers over 20% more flow at 43 psi compared to the stock OEM pump, making it an ideal upgrade for virtually any EFI application. For example, KEMSO's OEM replacement fuel pump supports up to 200 liters per hour, significantly surpassing the original flow rate of 60-80 liters per hour. This means your engine gets the fuel it needs, whether you are driving on the highway, towing a trailer, or pushing your vehicle hard on a twisty road.

KEMSO pumps are built to the highest quality standards. Every KEMSO fuel pump is individually tested and comes with a serialized pump body that guarantees a lifetime warranty. Unlike cheap aftermarket units that have little or no quality control program, KEMSO parts are manufactured under strict ISO/TSO standards, ensuring each pump meets or exceeds OEM specifications. Each pump is designed to work with both gasoline and E85/ethanol, giving you flexibility in fuel choice.

KEMSO offers a wide range of fuel pumps for many vehicle models. Whether you need a fuel pump for a car, motorcycle, ATV, or UTV, KEMSO has a direct replacement pump that fits perfectly. The KEMSO fuel pump is a high-performance OEM replacement backed by the same lifetime warranty, making it the best choice for restoring your vehicle's performance and reliability.

KEMSO stands behind its products with a lifetime warranty. When you purchase a KEMSO fuel pump, you are not just buying a part; you are investing in peace of mind. Visit their website to browse the complete selection of KEMSO fuel pumps for your vehicle: https://www.kemsoracing.com/. Their online store makes it easy to find the exact fuel pump for your specific vehicle model, and their customer support team can help answer any questions you may have about fitment or installation.

Preventing Future Fuel Pump Problems

Taking care of your vehicle's fuel pump can extend its life and prevent unexpected failures. Here are the most important preventive measures:

  1. Keep the tank at least one-quarter full. The fuel pump relies on gasoline for cooling and lubrication. Running the tank low causes the pump to overheat and wear out faster.

  2. Use quality fuel. Fill up at reputable gas stations that maintain their fuel storage tanks. Poor-quality fuel can contain water, dirt, and other contaminants that damage the fuel pump and clog the fuel filter.

  3. Replace the fuel filter regularly. A clogged fuel filter forces the fuel pump to work harder, which shortens its life. Follow your owner's manual recommendations for fuel filter replacement intervals, typically every 30,000 to 60,000 miles.

  4. Listen for changes. Pay attention to how your fuel pump sounds. If you notice a change from a quiet hum to a loud whine, have the system checked before the pump fails completely.

Final Thoughts

The fuel pump relay on your 2001 Jaguar S-Type is a simple component that can cause big problems when it fails. By knowing its location in the engine compartment fuse box, understanding the symptoms of a faulty relay, and learning how to test it, you can save yourself time and money. If the relay is not the issue, the fuel pump itself may need replacement, and choosing a high-quality aftermarket option like KEMSO will ensure reliable performance for years to come.

For the best selection of fuel pumps backed by a lifetime warranty, visit https://www.kemsoracing.com/ today.


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