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

The fuel pump relay on a Toyota 4Runner controls power to the fuel pump, and its location varies by generation. For most 1998-2002 models, it is inside the under-hood fuse/relay box near the battery, typically labeled "EFI" or "FUEL." However, earlier models (pre-1996) often place the relay inside the cabin behind the passenger kick panel or glove box. Knowing exactly where to find it saves you hours of troubleshooting when your 4Runner cranks but won't start.

Why the Fuel Pump Relay Matters

The fuel pump relay is an electrical switch that sends power from the battery to the fuel pump when the engine is cranking or running. When it fails, your fuel pump won't receive power, and the engine will crank without starting. Common symptoms include the engine cranking but not firing, stalling shortly after starting, or no fuel pressure at the fuel rail. Diagnosing a bad relay is often the first step before replacing the fuel pump itself.

Location by Generation

1998-2002 Toyota 4Runner (3rd Generation)

For the 1998 Toyota 4Runner, the fuel pump relay is located in the under-hood fuse and relay box. Open the hood and look near the battery on the driver's side. You'll find a rectangular black plastic box with a removable lid. The relay is typically labeled as "EFI" (Electronic Fuel Injection) or "FUEL" on the diagram inside the cover . It is usually a cube-shaped relay in slot #1 or #2 within the box. Confirm the exact position by checking the diagram printed on the underside of the lid .

The OEM Toyota part number for this relay is 90987-02028, and it is identical to other relays in the box, such as the horn relay, which allows you to perform a swap test .

1995-1997 Toyota 4Runner (3rd Generation)

For 1995-1997 models, the location differs based on engine type. On the 22R-E 4-cylinder engine, the fuel pump relay (also called the circuit opening relay) is located behind the front passenger side speaker or inside the glove box area. To access it, remove the lower left Philips screw, the lower right 10mm bolt, and the three top Philips screws inside the glove compartment . The relay part number for this era is often Toyota #85910-35010 or Denso #056700-8654 .

For the 1997 V6 models, some sources indicate the relay is in the under-hood fuse box near the passenger-side firewall, while others specify it is behind the driver's side kick panel . The best approach is to check both locations.

1990-1995 Toyota 4Runner (2nd Generation)

On these models, the fuel pump relay is consistently found behind the right kick panel (passenger side) or behind the glove box. It is called the circuit opening relay. The diagnostic connector under the hood has terminals FP and E1; jumping these terminals bypasses the relay and directly powers the fuel pump, which is a quick way to test if the relay is bad .

2003-2009 Toyota 4Runner (4th Generation)

For the N210 generation, the fuel pump relay is located in the engine compartment fuse box on the left side of the engine bay next to the battery. The fuse box diagram shows the EFI relay and fuel pump-related components within this box . The specific relay may be labeled "EFI" or "C/OPN" (circuit opening).

How to Test the Fuel Pump Relay

Before buying a new relay, test the existing one. Here are three reliable methods:

1. Swap Test. This is the easiest method. Find a relay in the same box that looks identical (same part number and number of pins). Common substitutes include the EFI relay, horn relay, or starter relay. Pull out the suspected fuel pump relay and swap it with the known good relay. Reconnect the battery, turn the ignition to "On," and listen for the fuel pump to prime. If the pump hums and the engine starts, the original relay is faulty .

2. Visual Inspection and Fuse Check. Locate the fuse for the fuel pump circuit, often labeled "EFI" or "AM2" (usually 15A or 20A). Remove the fuse and look at the metal wire inside. If it is broken or melted, the fuse is blown. Replace it with a fuse of the exact same amperage. A blown fuse often indicates a short circuit elsewhere, such as a failing fuel pump motor .

3. Multimeter Test. Remove the relay from its socket. With the ignition on, use a multimeter to check for battery voltage (12V+) on the power supply pin. Then check for voltage on the ECM signal pin when the key is turned to "On" (you should see voltage for 1-2 seconds during the prime cycle). Check the ground pin for continuity to chassis ground. If power is present but the relay doesn't click, the relay itself is likely bad .

Replacement Steps

Replacing the fuel pump relay is straightforward:

1. Disconnect the negative battery cable to prevent short circuits.
2. Open the hood and remove the cover of the fuse/relay box.
3. Locate the fuel pump relay using the diagram inside the cover.
4. Pull the old relay straight out of its socket.
5. Insert the new relay, pressing firmly until it clicks into place.
6. Reconnect the battery and test by turning the ignition to "On." You should hear the fuel pump prime for 1-2 seconds.

Always use a high-quality replacement relay. The OEM Toyota part number for many 4Runner models is 90987-02028 or 28300-16040 .

What to Do If the Relay Checks Out

If the relay tests good but the fuel pump still has no power, the problem may be elsewhere. Check the EFI relay (located in the same box), the fuel pump fuse, the wiring harness, and the fuel pump itself. On older models, the circuit opening relay is activated by the air flow meter or the ECM. If the ECM does not receive a signal from the crankshaft position sensor, it will not trigger the relay .

Final Thoughts

Knowing your Toyota 4Runner fuel pump relay location is the first step in diagnosing a no-start condition. Whether it's under the hood near the battery or behind the passenger kick panel, a bad relay is a common failure point that is easy and inexpensive to fix. Always test the relay before replacing the fuel pump, as many owners have replaced a perfectly good pump only to find the relay was the culprit.

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