2000 Toyota Sienna Fuel Pump Relay Location: The Complete Guide to Finding, Testing, and Replacing It

The bottom line: On a 2000 Toyota Sienna, the fuel pump relay is located in the under-hood fuse box (engine room junction block), not inside the cabin. The relay is a standard four-pin or five-pin unit labeled "EFI" or "Fuel Pump" on the fuse box diagram. If your Sienna cranks but won't start, or if it stalls unexpectedly while driving, the fuel pump relay is one of the first components to check before replacing the fuel pump itself.

1. Understanding the Fuel Pump Relay's Role

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the ignition key to the "ON" position, the relay closes, sending battery voltage to the fuel pump for a few seconds to prime the system. Once the engine starts, the relay keeps the pump running as long as the engine is running. If the relay fails, the fuel pump won't receive power, and the engine will either not start or stall immediately after starting.

The 2000 Toyota Sienna uses a standard relay design that is common across many Toyota vehicles from that era. The relay is designed to handle the electrical load of the fuel pump, which is typically around 5 to 10 amps during normal operation.

2. Locating the Fuel Pump Relay on Your 2000 Toyota Sienna

Here is a step-by-step guide to help you find the fuel pump relay:

Step 1: Open the Hood
Pop the hood of your 2000 Toyota Sienna. The fuse box is located on the driver's side of the engine bay, near the battery. It is a black plastic box with a removable lid.

Step 2: Remove the Fuse Box Lid
Press the tabs on the sides of the lid and lift it off. On the underside of the lid, you will find a diagram or a label that shows the location and function of each fuse and relay. Some models have the diagram printed directly on the fuse box body.

Step 3: Identify the Fuel Pump Relay
Look for a relay labeled "EFI" (Electronic Fuel Injection) or "Fuel Pump" on the diagram. On most 2000 Sienna models, the fuel pump relay is a larger relay compared to the smaller fuses. It is usually located near the center or the right side of the fuse box. If the diagram is faded or missing, check your owner's manual for the specific layout. A common position for the EFI relay is in the second row from the top, third from the left, but this can vary slightly depending on the exact production date of your vehicle.

Step 4: Visual Confirmation
The relay itself is a small, rectangular black box with four or five metal prongs on the bottom. Pull it straight up using your fingers or a pair of pliers if it is stuck. Compare it to other relays in the box to confirm you have the correct one.

3. How to Test the Fuel Pump Relay

Testing the relay is straightforward and requires only a multimeter and a small piece of wire.

1. Remove the Relay
Pull the relay out of the fuse box.

2. Inspect Visually
Check the relay for any signs of corrosion, burn marks, or melted plastic. If you see any damage, replace it immediately.

3. Set Your Multimeter
Turn your multimeter to the resistance (ohms) setting.

4. Test the Coil Side
The relay has two sets of pins: the coil side and the switch side. The coil side typically has two pins (usually pins 85 and 86). Measure the resistance between these two pins. A good relay will show a resistance reading between 50 and 200 ohms. If you get an "OL" (open line) or a reading near zero, the relay coil is defective.

5. Test the Switch Side
The switch side typically has two pins (usually pins 30 and 87). With no power applied to the coil, there should be no continuity between pins 30 and 87. The multimeter should show "OL" or infinite resistance.

6. Apply Power to the Coil
Use a small jumper wire to connect pin 85 to the positive terminal of a 12V battery or a known good 12V source. Connect pin 86 to the negative terminal (ground). You should hear an audible "click" as the relay engages.

7. Retest the Switch Side
While the relay is energized (clicked), measure the resistance between pins 30 and 87 again. You should now see near-zero resistance (continuity), typically less than 1 ohm. If the relay clicks but does not show continuity, the internal switch is faulty.

4. Common Symptoms of a Faulty Fuel Pump Relay

If your fuel pump relay is failing, you may experience one or more of the following symptoms:

  • Engine cranks but won't start: This is the most common symptom. The starter motor turns the engine over, but the fuel pump never primes because the relay is not sending power.
  • Engine stalls while driving: The relay may lose electrical contact intermittently, causing the fuel pump to stop running while the engine is running. The engine will stall immediately, and you may be able to restart it after a few minutes when the relay cools down and reconnects.
  • No fuel pump prime noise: When you turn the ignition key to the "ON" position (without starting the engine), you should hear a short whirring sound from the rear of the vehicle for about 2 to 3 seconds. This is the fuel pump priming. If you do not hear this sound, and the engine won't start, the relay is a likely suspect.
  • Check Engine Light: In some cases, a failing relay can trigger a check engine light with a code related to a fuel pump circuit malfunction (such as P0230).

5. How to Replace the Fuel Pump Relay

Replacing the fuel pump relay is one of the easiest repairs you can do on your 2000 Toyota Sienna.

1. Purchase a Replacement Relay
You can buy a new fuel pump relay from any auto parts store, Toyota dealership, or online retailer. Make sure you get the correct relay for your Sienna. The OEM part number is typically 90987-02003 or a similar variant. Aftermarket relays that match the same specifications also work fine. The cost of a new relay is usually between $10 and $30.

2. Disconnect the Battery
Before working with any electrical components, disconnect the negative terminal of the battery. This prevents accidental shorts and protects the vehicle's electrical system.

3. Remove the Old Relay
Pull the old relay straight up from the fuse box socket. It may require a bit of force, but it should come out easily.

4. Install the New Relay
Push the new relay straight down into the same socket. Make sure it is fully seated and that the prongs align correctly. You will hear a slight click when it is fully inserted.

5. Reconnect the Battery
Reconnect the negative battery terminal.

6. Test the System
Turn the ignition key to the "ON" position. Listen for the fuel pump prime sound. If you hear it, the relay is working correctly. Start the engine and let it idle for a few minutes to confirm everything is operating normally.

6. Other Components to Check If the Relay Works

If you have tested the relay and it is working correctly, but you still have no fuel pump operation, there are several other components to inspect:

  • Fuel Pump Fuse: Check the fuse box for the fuel pump fuse. A blown fuse will prevent power from reaching the relay and the pump.
  • Fuel Pump Resistor: The 2000 Sienna has a fuel pump resistor that can fail. The resistor is located near the fuel tank or on the frame rail. You can test it with a multimeter. The standard resistance should be within a specific range as listed in the service manual.
  • Wiring and Connectors: Inspect the wiring harness from the relay to the fuel pump for any signs of damage, corrosion, or loose connections. Pay special attention to the connector at the fuel pump itself, as it is exposed to moisture and road debris.
  • Fuel Pump Itself: If the relay, fuse, resistor, and wiring all check out, the fuel pump itself may be faulty. The fuel pump is located inside the fuel tank. Replacing it is a more involved job that requires dropping the fuel tank or accessing it through a panel in the cabin.

7. Why You Should Consider a KEMSO Fuel Pump for Your 2000 Toyota Sienna

If you determine that your 2000 Toyota Sienna needs a new fuel pump, or if you are replacing the pump as a preventive measure, the KEMSO brand offers an excellent solution. KEMSO is a leading aftermarket fuel pump manufacturer that has earned a reputation for quality and reliability.

KEMSO Fuel Pumps are designed as direct OEM replacements. This means they match the exact specifications of the original Toyota fuel pump in terms of voltage, amperage, pressure, and flow rate. Your engine will receive the correct fuel volume at all times, whether you are cruising on the highway or climbing a steep grade.

High Performance: KEMSO pumps deliver over 20% more flow at 43 psi compared to the stock OEM pump. This provides a safety margin for older vehicles whose fuel systems may have degraded over time. The pump supports up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications, making it a robust choice for daily drivers.

Unmatched Quality: Every KEMSO fuel pump is individually tested for flow and pressure before it leaves the factory. The pumps are built with high-quality materials that resist corrosion and wear. The motor is sealed to prevent fuel contamination, and the internal components are tested for durability.

Lifetime Warranty: KEMSO stands behind its products with a lifetime warranty. If your pump ever fails due to a manufacturing defect, KEMSO replaces it free of charge. No questions, no hassle. This is a level of confidence that few other aftermarket brands offer.

Complete Kit: When you buy a KEMSO fuel pump, you get everything you need for a successful installation. The kit includes the pump, two gradient density fuel strainers, a flex hose, a tank seal, Viton O-rings, a wiring connector, crimp connectors, hose clamps, and zip-ties. The wiring connector matches the original, so you do not need to cut or splice wires.

Visit the KEMSO website today to find the correct fuel pump for your 2000 Toyota Sienna. Their team can help you confirm compatibility and answer any questions about installation. With KEMSO, you get performance you can trust and support that lasts.

Final Thoughts

Finding the fuel pump relay on your 2000 Toyota Sienna is a simple task that any DIY owner can handle. The relay is located in the under-hood fuse box, and testing it with a multimeter is quick and easy. If the relay is faulty, replacement is a straightforward process that costs less than $30 and takes about 10 minutes.

If the relay, fuse, and wiring are all good, but the fuel pump is not working, the pump itself is likely the culprit. When you need a replacement, choose a pump that matches your vehicle exactly. KEMSO Fuel Pumps provide that perfect match with proven durability and a lifetime warranty.

For more information and to find the right fuel pump for your 2000 Toyota Sienna, visit: https://www.kemsoracing.com/


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