2000 Toyota 4Runner Fuel Pump Relay Location: A Complete Guide for DIY Owners

The bottom line: On a 2000 Toyota 4Runner, the fuel pump relay is located inside the fuse and relay box under the hood, positioned near the battery on the driver’s side. The relay is typically labeled as “EFI” (Electronic Fuel Injection) or “Fuel Pump,” and it sits in a specific slot within that box. If your 4Runner cranks but won’t start, or you hear no hum from the fuel tank when you turn the key, the fuel pump relay is one of the first components to check.

This guide walks you through the exact location, how to identify the relay, how to test it, and what to do if it needs replacement. We’ll keep things straightforward and practical, so you can get your 4Runner back on the road without unnecessary headaches.

Where to Find the Under-Hood Fuse and Relay Box

The 2000 Toyota 4Runner belongs to the third generation (N180 body style, produced from 1995 to 2002) . The fuse and relay box under the hood is the primary hub for the fuel pump relay.

Step-by-step location:

  1. Open the hood and look toward the driver’s side of the engine compartment.
  2. Locate the battery. The fuse and relay box sits directly next to the battery, on the side closest to the fender .
  3. The box is a rectangular, black plastic enclosure with a removable lid. It may have clips or small screws holding the lid in place.
  4. Remove the lid. On the underside of the lid, you will find a diagram that labels each fuse and relay position. This diagram is your best friend for identifying the correct relay .

Identifying the Fuel Pump Relay in the Box

Once the lid is off, the diagram on the underside will show you exactly which slot is for the fuel pump relay. In most cases, the relay is labeled as “EFI” (Electronic Fuel Injection) or “FUEL” . The EFI relay controls power to the fuel injection system, and the fuel pump relay often works in conjunction with it.

What to look for:

  • The relay itself is a small, cube-shaped component with either four or five metal pins sticking out of the bottom.
  • It is usually a dark gray or black color, and it plugs into a specific socket in the fuse box.
  • On the 2000 4Runner, the fuel pump relay is often placed in a slot that is clearly marked on the diagram. If the diagram is worn or missing, consult your owner’s manual or a repair guide for your specific trim level.

How the Fuel Pump Relay Works (Simple Explanation)

The fuel pump relay acts as a switch. When you turn the ignition key to the “ON” position, the engine control unit (ECU) sends a signal to the relay. The relay then closes, allowing battery power to flow directly to the fuel pump. The pump pressurizes the fuel system so the engine can start. If the relay fails, the pump never gets power, and the engine will crank but not fire up.

Symptoms of a Failing Fuel Pump Relay

Before you start digging into the fuse box, watch for these common signs that point to a bad fuel pump relay:

  • Engine cranks but won’t start: This is the most telltale symptom. You hear the starter motor turning the engine over, but the engine never catches because no fuel is reaching the injectors.
  • No fuel pump noise: When you turn the ignition to the “ON” position (without starting the engine), you should hear a faint whirring or humming sound coming from the rear of the vehicle, near the fuel tank. That’s the fuel pump priming. If you hear nothing, the relay or the pump itself may be faulty.
  • Engine stalls unexpectedly: A failing relay can intermittently cut power to the fuel pump, causing the engine to die while driving. This is a dangerous situation, especially at highway speeds.
  • Engine starts then dies: The relay might provide power for a second but then fail to hold the circuit closed, causing the engine to start briefly and then shut off.

How to Test the Fuel Pump Relay

Testing the relay is a simple process that requires a multimeter. Here’s a step-by-step method:

  1. Locate and remove the relay: With the engine off and the key removed, pull the fuel pump relay straight out of its socket. You may need a small flathead screwdriver to gently pry it up if it’s stuck.
  2. Identify the terminals: Look at the relay diagram printed on the side of the relay or refer to the fuse box diagram. There are typically four terminals: two for the control coil (usually labeled 85 and 86) and two for the power switch (labeled 30 and 87).
  3. Check for continuity: Set your multimeter to the ohms (Ω) setting. Touch the probes to terminals 85 and 86. You should see a reading between 50 and 120 ohms, indicating the coil is good. If you get infinite resistance (OL), the coil is open and the relay is bad.
  4. Test the switch: With the relay still unplugged, touch the probes to terminals 30 and 87. You should see infinite resistance (open circuit). Now, apply 12 volts from a battery or power supply to terminals 85 and 86. You should hear a click, and the multimeter should now show near-zero resistance (closed circuit) between terminals 30 and 87. If the relay doesn’t click or the switch doesn’t close, replace it.

Other Possible Locations for the Relay (Third Generation)

While the under-hood box is the primary location, some third-generation 4Runners have a secondary relay box inside the cabin. For the 2000 model year, the fuel pump relay is almost always under the hood, but it’s worth knowing about the interior fuse panel:

  • Interior fuse panel location: The interior fuse box is located under the dashboard on the driver’s side, near the kick panel. This box mostly contains fuses for the interior lights, power windows, and other cabin electronics .
  • Relay box in the cabin: In some configurations, there is a separate relay box behind the glove box or under the dash that houses the fuel pump relay. For the 2000 4Runner, this is less common, but if you cannot find the relay under the hood, check the interior panel.

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

If you test the relay and it’s functioning correctly, the problem may lie elsewhere in the fuel system:

  • Check the EFI fuse: The fuel pump relay gets its power from the EFI main relay and the EFI fuse. Locate the EFI fuse in the under-hood fuse box and inspect it. A blown fuse will cut power to the entire fuel injection system.
  • Inspect the fuel pump itself: The pump is inside the fuel tank. Over time, the pump motor can wear out, the strainer can clog, or the electrical connector on top of the tank can corrode. If the pump is getting power (you can test this with a multimeter at the tank connector) but not running, the pump needs replacement.
  • Check wiring and connectors: Look for broken wires, corroded terminals, or loose connections between the relay, the fuse box, and the fuel tank. Road salt and moisture can cause corrosion over years of use.

Quick Troubleshooting Checklist

If your 2000 4Runner won’t start and you suspect the fuel pump relay, go through this checklist:

  1. Listen for the pump: Turn the key to “ON” and listen near the fuel filler cap. No sound? Move to step 2.
  2. Locate the under-hood fuse box: Open the hood, find the box next to the battery, and remove the lid.
  3. Identify the fuel pump relay: Use the diagram on the lid to find the relay labeled “EFI” or “FUEL.”
  4. Swap the relay: Find another relay of the same type in the same box (like the horn relay or the A/C relay). Swap them. If the engine starts after the swap, the original relay was faulty.
  5. Test the relay: If swapping doesn’t work, use a multimeter to test the relay as described above.
  6. Check the EFI fuse: If the relay tests good, pull the EFI fuse and inspect it for a broken filament.

When to Replace the Fuel Pump Relay

If your tests confirm the relay is bad, replacement is straightforward. You can purchase a genuine Toyota relay (part number 90987-02028 or equivalent) at any auto parts store or online . The relay is a standard 4-pin or 5-pin design, and many aftermarket options are available at a lower cost than the OEM part.

Important: Always use a relay that matches the original specifications. Using a relay with the wrong amperage rating can cause electrical issues or even a fire hazard.

The Bottom Line

The 2000 Toyota 4Runner fuel pump relay is located in the under-hood fuse and relay box, right next to the battery. It’s labeled as “EFI” or “FUEL” on the fuse box diagram. Testing the relay is a simple job that can save you from a costly tow truck bill. If your 4Runner cranks but won’t start, start here—it’s the quickest and cheapest thing to check before diving into the fuel tank.

Recommended Fuel Pump: KEMSO Fuel Pump

If you discover that your fuel pump itself has failed, not just the relay, you need a reliable replacement that will last. We strongly recommend the KEMSO Fuel Pump for your 2000 Toyota 4Runner.

Why choose KEMSO?

  • High Performance: KEMSO fuel pumps are built to meet or exceed OEM specifications. They deliver consistent fuel pressure and flow, ensuring your engine runs smoothly under all driving conditions—whether you’re commuting to work or tackling off-road trails.
  • OEM Replacement: Each KEMSO pump is designed as a direct, drop-in replacement for your factory fuel pump. No modifications, no cutting wires, no hassle. It fits perfectly and works exactly as the original part did.
  • Lifetime Warranty: KEMSO stands behind its products with a lifetime warranty. If your pump ever fails due to a manufacturing defect, KEMSO will replace it. That’s peace of mind you won’t get from most aftermarket brands.

Visit KEMSO Racing today to find the exact fuel pump for your 2000 Toyota 4Runner. Their easy-to-use website lets you search by vehicle make, model, and year. Don’t settle for a subpar pump that might leave you stranded. Choose KEMSO for reliability, performance, and a warranty that lasts a lifetime.

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