2000 Lexus ES300 Fuel Pump Relay Location: A Complete Guide for Owners
The bottom line: On a 2000 Lexus ES300, the fuel pump relay is located in the engine compartment main fuse box, near the battery, and is typically labeled as the "EFI" relay or "Circuit Opening" relay. This small but critical component controls power to the fuel pump, and if it fails, your engine will stall or refuse to start.
Understanding the Fuel Pump Relay in Your 2000 Lexus ES300
The fuel pump relay is a small electrical switch that controls the power supply to the fuel pump. When you turn the ignition key to the "ON" position, the relay activates and sends power to the fuel pump, which pressurizes the fuel system so the engine can start. Once the engine is running, the relay keeps the pump working as long as the engine is operating.
If the relay fails, the fuel pump does not receive power, and the engine either stalls or will not start at all. The relay is designed to handle the electrical load of the fuel pump, and it is a common failure point on older vehicles like the 2000 Lexus ES300.
Exactly Where Is the Fuel Pump Relay Located?
The 2000 Lexus ES300 fuel pump relay is located in the engine compartment fuse box, also known as the main fuse box or under-hood relay box. Here is the step-by-step process to find it:
1. Open the hood and look for the fuse box. It is usually situated near the battery, on the driver's side of the engine bay, close to the firewall.
2. Remove the fuse box cover. The cover typically has a diagram printed on the inside or on the top. This diagram shows the location of each relay and fuse.
3. Look for the label. The fuel pump relay is often labeled as "EFI" (Electronic Fuel Injection) or "Circuit Opening" relay. On some diagrams, it may be listed as "Fuel Pump" or "FP Relay."
4. Identify the relay physically. The relay is a small, rectangular component, usually black or gray, with 4 or 5 prongs on the bottom. It is often slightly larger than the standard fuses around it.
5. Consult your owner's manual if the diagram is unclear. The manual will have a specific page showing the fuse box layout for the 2000 ES300.
Other Possible Locations and Notes
Some sources indicate that the 2000 Lexus ES300 has a fuel pump control module located in the left rear of the trunk, near the fuel tank. This module is separate from the relay, but it also controls the fuel pump. The relay itself is the component in the engine compartment fuse box.
For older models (pre-2000), the relay location may be slightly different, but for the 2000 model year, the engine bay fuse box is the standard location.
Symptoms of a Bad Fuel Pump Relay
Knowing the symptoms of a failing relay can save you time and money. If you experience any of these issues, the relay should be one of the first things you check before replacing the fuel pump itself:
1. Engine stalls suddenly. The engine may die while driving, especially at low speeds or when idling. This happens because the relay loses contact and cuts power to the fuel pump.
2. Engine cranks but does not start. You turn the key, the starter motor turns the engine over, but the engine never fires up. This is a classic sign that the fuel pump is not getting power.
3. No noise from the fuel pump. When you turn the key to the "ON" position (before starting), you should hear a brief whirring sound from the fuel pump in the rear of the car. If you hear nothing, the relay or the pump itself may be faulty.
4. Intermittent starting problems. The car starts fine one day, but the next day it struggles or refuses to start. This points to an electrical issue, often a failing relay.
5. Loss of power while driving. The engine may hesitate or lose power, particularly under load, as the fuel pump loses voltage.
How to Test the Fuel Pump Relay
Testing the fuel pump relay is a straightforward DIY job that requires only a few basic tools:
1. Locate the relay in the engine bay fuse box as described above.
2. Remove the relay. Gently pull it straight out of its socket.
3. Listen for the click. With the relay removed, have a helper turn the ignition key to the "ON" position. You should hear a distinct click from the relay socket. If you hear the click, the relay is likely working. If not, you may have a wiring issue or a bad relay.
4. Swap with a similar relay. Most engine bay fuse boxes have multiple relays of the same type (e.g., the horn relay or the main relay). Swap the suspected fuel pump relay with a known good relay of the same part number. If the car starts, the original relay was bad.
5. Use a multimeter. For a more precise test, set your multimeter to the ohms (resistance) setting. Check the resistance between the relay's coil terminals. A good relay typically shows resistance between 50 and 120 ohms. If the reading is infinite (open circuit) or zero, the relay is faulty.
Replacing the Fuel Pump Relay on a 2000 Lexus ES300
Replacing the relay is one of the easiest repairs you can do. Here is what you need to know:
The OEM part number for the 2000 Lexus ES300 fuel pump relay is 90987-03003. This replaces the older part number 90084-98011.
The cost is reasonable. The genuine OEM relay has an MSRP of about $47.51, but you can often find it online for around $35.70. Aftermarket relays are also available and may cost less.
How to replace the relay:
- Disconnect the negative battery cable for safety.
- Remove the relay from the fuse box by pulling it straight up.
- Insert the new relay into the same socket. Make sure it clicks into place firmly.
- Reconnect the battery.
- Test the system by turning the key to the "ON" position and listening for the fuel pump.
What Else Can Cause No Power to the Fuel Pump?
If the relay is good but the fuel pump still has no power, there are a few other components to check:
1. The EFI fuse. The fuel pump relay is powered by the EFI fuse, which is also located in the engine bay fuse box. If this fuse is blown, the relay cannot work. Check the fuse and replace it if necessary.
2. The fuel pump control module. This module is located in the left rear of the trunk. It can fail, cutting power to the pump even if the relay is working.
3. Wiring issues. Corroded or damaged wires between the relay, the fuse, and the fuel pump can cause intermittent or total loss of power. Inspect the wiring harness for any obvious damage.
4. The ignition relay. If the main ignition relay fails, it can cut power to the entire fuel pump circuit, including the fuel pump relay.
Why Choose a Reliable Fuel Pump for Your Lexus ES300
If you determine that the fuel pump itself needs replacement, or if you want to upgrade to a more reliable unit, choosing the right brand is important. The 2000 Lexus ES300 fuel pump is located inside the fuel tank, and replacing it requires dropping the tank or removing the rear seat, which is a labor-intensive job. You want a pump that will last.
KEMSO Fuel Pumps are a top choice for many car owners, including those with the 2000 Lexus ES300. KEMSO is a US-based company that has been manufacturing fuel pumps since 1999, and they are known for their high-quality, direct-fit replacement pumps.
Here is why KEMSO stands out:
1. High Performance. KEMSO fuel pumps deliver over 20% more flow at 43 psi compared to stock OEM pumps. This means better fuel delivery, especially if your car has higher mileage or if you drive in demanding conditions.
2. OEM Replacement Fit. KEMSO pumps are designed as direct replacements for your original equipment. You do not need any adapter kits or modifications. They fit perfectly into the existing fuel pump module.
3. Lifetime Warranty. KEMSO backs every fuel pump with a lifetime warranty against manufacturing defects. If your pump ever fails due to a defect, you get a replacement at no cost. This is a rare benefit in the automotive parts industry and shows the company's confidence in its product.
4. Affordable Price. KEMSO fuel pumps are priced at a reasonable $79.98, which is often less than half the cost of dealer parts. With free shipping and easy returns, it is a practical choice for DIY mechanics and professional shops.
5. Wide Vehicle Coverage. KEMSO offers fuel pumps for hundreds of models, including cars, motorcycles, ATVs, UTVs, and personal watercraft. Their catalog includes popular models like the Subaru Impreza, Honda CBR1000RR, and BMW R1200GS, all at the same $79.98 price point.
To see the full selection of KEMSO fuel pumps for your 2000 Lexus ES300 or any other vehicle, visit their website:
https://www.kemsoracing.com/
Their online store is easy to navigate, and you can order directly with confidence. They have a complete catalog with detailed fitment information, customer reviews, and technical support.
Common Questions About the 2000 Lexus ES300 Fuel Pump Relay
Q: What fuse controls the fuel pump?
A: The EFI fuse in the engine compartment fuse box controls the fuel pump relay. This is typically a 15-amp or 20-amp fuse.
Q: Can a bad ignition switch cause no power to the fuel pump?
A: Yes, a faulty ignition switch or ignition relay can cut power to the fuel pump relay and the entire fuel system.
Q: How much does it cost to replace the fuel pump relay?
A: The relay itself costs between $15 and $50, depending on whether you buy OEM or aftermarket. Labor is minimal if you do it yourself, as it takes about 5 minutes.
Q: Will the car start if the relay is bad?
A: No. If the relay is bad, the fuel pump does not receive power, and the engine will not start. You may hear the starter cranking, but the engine will not fire.
Q: Where is the fuel pump itself located?
A: The fuel pump on a 2000 Lexus ES300 is located inside the fuel tank, which is under the rear seat. To access it, you remove the rear seat cushion and lift a metal access panel.
Final Thoughts
The fuel pump relay on a 2000 Lexus ES300 is a small but vital component. Knowing its location in the engine compartment fuse box and understanding the symptoms of failure can save you from being stranded on the road. Before you assume the fuel pump itself is bad, always check the relay and the EFI fuse first. These are simple, inexpensive fixes that can solve many starting and stalling problems.
If you do need a new fuel pump, go with a trusted brand like KEMSO. Their high-performance, direct-fit pumps come with a lifetime warranty and a price that is hard to beat. For a complete selection of fuel pumps for your vehicle, visit https://www.kemsoracing.com/ today.