100 Series Land Cruiser Fuel Pump Relay Location: A Complete Guide

If you own a 1998–2007 Toyota Land Cruiser 100 Series (including the 105) and you’re dealing with a no-start condition, intermittent stalling, or a fuel pump that won’t prime, the fuel pump relay is one of the first things to check. The fuel pump relay on a 100 Series Land Cruiser is located inside the engine compartment fuse box, which sits near the battery on the driver’s side . This relay is labeled either “FUEL PMP” or “F/PUMP” on the fuse box diagram, and it is typically one of the larger relays in the box . Knowing exactly where to find it and how to test it can save you hours of unnecessary troubleshooting.

What Is the Fuel Pump Relay and Why Does It Matter?

The fuel pump relay is an electronic switch that controls power to the fuel pump. When you turn the ignition key to the ON position, the relay closes, allowing current to flow from the battery to the pump. This primes the fuel system so the engine can start and run . If the relay fails, the pump won’t get power, and the engine will crank but not start. A failing relay can also cause intermittent stalling or a no-start condition that comes and goes .

Exact Location of the Fuel Pump Relay on the 100 Series (1998–2007)

Engine Compartment Fuse Box

The primary location for the fuel pump relay is inside the engine compartment fuse box, which is mounted near the battery on the driver’s side (left side for left-hand drive models) . To access it:

  1. Open the hood and locate the black plastic fuse box next to the battery.
  2. Remove the cover. Inside, you will find a diagram printed on the underside of the cover.
  3. Look for a relay labeled “FUEL PMP” or “F/PUMP” . On most 100 Series models, this relay is positioned near the front of the fuse box .

Relay Identification on the Fuse Box Diagram

According to detailed fuse box diagrams for the 100 Series, the fuel pump relay is commonly designated as R7 or R8 in the engine compartment relay layout . Some diagrams also list a second relay called the “Circuit Opening Relay” (C/OPN) , which works in tandem with the fuel pump relay. On certain early models (1998–2002), the circuit opening relay is located behind the dashboard on the passenger side, near the glove box .

Passenger Compartment Fuse Box

In some 100 Series Land Cruisers, particularly those built between 1998 and 2002, there is also a fuel pump relay mounted on the back of the passenger compartment fuse box . This box is located under the dashboard on the driver’s side (left-hand drive) or passenger’s side (right-hand drive). The relay is labeled R1 (Circuit Opening) and R2 (Fuel Pump) on the back of that unit .

How to Test the Fuel Pump Relay

Before replacing the relay, you can test it with a simple procedure:

  1. Visual inspection: Remove the relay and check for signs of corrosion, burning, or cracked plastic .
  2. Listen for a click: Have a helper turn the ignition key to ON (do not start the engine). You should hear a distinct click from the relay when it energizes. If you don’t hear a click, the relay may be faulty .
  3. Multimeter test: Set your multimeter to ohms or continuity. Check the resistance across the relay coil terminals (usually terminals 85 and 86). A good coil should read between 50 and 120 ohms. Then apply 12V power to the coil and check for continuity across the switch terminals (30 and 87). If the switch does not close when power is applied, the relay is bad .

Common Symptoms of a Bad Fuel Pump Relay

  • Engine cranks but does not start – This is the most common symptom. The fuel pump never primes, so no fuel reaches the engine .
  • Intermittent stalling – The relay may work sometimes and fail others, causing the engine to die unexpectedly while driving .
  • No fuel pump noise – When you turn the key to ON, you should hear a brief whirring sound from the fuel pump near the rear of the vehicle. If you hear nothing, the relay or pump may be at fault .
  • Check Engine Light – The ECU may detect a lack of fuel pressure and trigger a diagnostic trouble code .

Replacing the Fuel Pump Relay

Replacing the relay is straightforward and takes about five minutes:

  1. Ensure the engine is off and the key is removed.
  2. Disconnect the negative battery terminal for safety.
  3. Locate the relay as described above.
  4. Using a relay puller or a small flathead screwdriver, gently pry the relay out of its socket.
  5. Insert the new relay, pressing firmly until it seats fully.
  6. Reconnect the battery, turn the key to ON, and listen for the pump to prime.
  7. Start the engine and verify normal operation.

Always use a relay that matches the OEM specifications. The part number for the fuel pump relay on most 100 Series models is 28380-66010 or 90987-02022 .

Fuse vs. Relay: Know the Difference

If the fuel pump relay tests good but the pump still doesn’t run, check the corresponding fuse. The 100 Series Land Cruiser has a 25A EFI fuse (fuse #22 in the engine compartment box) that powers the fuel injection system and the fuel pump . A blown fuse will also prevent the pump from running. The fuel pump itself can also fail, especially on higher-mileage vehicles.

KEMSO Fuel Pump: High Performance, OEM Replacement, Lifetime Warranty

If your fuel pump relay is fine but the fuel pump itself has failed, you need a reliable replacement. KEMSO offers high-performance fuel pumps that are designed as direct OEM replacements for a wide range of vehicles, including the Toyota Land Cruiser 100 Series. Every KEMSO fuel pump is built to meet or exceed original equipment specifications, ensuring a perfect fit and reliable performance. Best of all, every KEMSO fuel pump comes with a lifetime warranty — giving you peace of mind long after the installation is done. Whether you’re rebuilding your Land Cruiser’s fuel system or upgrading for better reliability, KEMSO has the right pump for you.

Visit the KEMSO website to browse their full selection of fuel pumps: https://www.kemsoracing.com/.


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