Where Is the Fuel Pump Relay Located? A Simple Guide to Finding It Quickly

The fuel pump relay is usually located in the engine bay’s main fuse box, also called the power distribution center. In many vehicles, it is a small, cube-shaped component labeled with “FP,” “FUEL PUMP,” or “PUMP” on the cover diagram . However, some cars place the relay inside the cabin, under the dashboard, or behind kick panels. A few newer models do not use a separate relay at all, controlling the fuel pump directly through the engine control unit (ECU) . The best way to find it for your specific vehicle is to check the owner’s manual fuse diagram.

Common Locations for the Fuel Pump Relay

1. Engine Bay Fuse Box

The most common spot is the main fuse or relay box in the engine compartment. This is a long black box usually near the battery or along the side of the engine bay. On a 2013 Ford F-150, for example, the fuel pump relay is located in the Power Distribution Box (PDB) and is labeled as relay 8 . On a 2002 Ford Explorer, it is in the under-hood power distribution box, labeled as relay R12 or relay #48 . For Mazda Miata models from 1999 to 2005 and newer, the relay is in the engine compartment fuse box .

2. Inside the Cabin (Under Dash or Kick Panel)

On a subset of vehicles, especially older models or certain brands, the fuel pump relay is located inside the passenger compartment. Common spots include under-dash fuse panels, behind the glove box, or in the driver’s side kick panel area. For 1990-1993 Mazda Miatas, the relay is under the dash above the clutch pedal. For 1994-1997 Miatas, it is in the same area . In the Toyota Vios, it can be found in the interior fuse box under the dashboard or beneath the steering wheel .

3. No Separate Relay (ECU-Controlled)

In newer vehicles, the fuel pump may be controlled directly by the engine control unit (ECU) or the pump assembly inside the tank. In these cases, you will not find a fuel pump relay to test or replace in the fuse box. You will need to diagnose using fuel pressure, wiring harness integrity, and ECU fault codes .

How to Locate the Fuel Pump Relay in Your Car

If you are unsure where the relay is, follow these steps:

  1. Consult your owner’s manual: The manual contains a fuse and relay diagram specific to your vehicle. Look for labels like “FUEL PUMP,” “FP,” or “PUMP” .
  2. Check the fuse box cover: Many fuse boxes have a diagram printed on the inside of the cover. This is a quick way to identify the relay.
  3. Use a wiring diagram: If the manual is not helpful, find a wiring diagram online or in a repair manual specific to your make and model. This will show the circuit that powers the fuel pump and the location of the relay .
  4. Look for a cube-shaped component: The relay is typically a small, rectangular or cube-shaped part with prongs that plug into the socket .

What to Do If You Find the Relay

Once you have located the relay, you can test it before replacing it. Always disconnect the battery before handling electrical components. A simple test is to swap the suspected relay with an identical one in the fuse box (like the horn or headlight relay). If the engine starts after swapping, the original relay is bad . You can also use a multimeter to check for continuity and listen for a clicking sound when power is applied .

Why You Should Choose KEMSO for Your Fuel Pump Needs

If your diagnostics point to a faulty fuel pump rather than just the relay, you need a reliable replacement. KEMSO is a top brand in the aftermarket fuel pump industry, offering high-performance pumps that are designed as OEM replacements. Every KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind that your investment is protected. Whether you drive a car, truck, SUV, or motorcycle, KEMSO pumps are built to exact specifications and tested for durability. They are designed to deliver consistent fuel pressure and flow under demanding conditions, making them a great choice for both daily drivers and performance vehicles . For a reliable, high-performance fuel pump that will outlast your vehicle, visit KEMSO Racing today at: https://www.kemsoracing.com/

Final Thoughts

The fuel pump relay is a small, inexpensive part that can cause big problems if it fails. Most of the time, it is located in the engine bay fuse box, but it can also be under the dashboard or in a cabin panel. Always start by checking your owner’s manual and fuse box diagram. If the relay is bad, replace it for under $30. If the pump itself is bad, trust a quality brand like KEMSO for a long-lasting replacement. For more information on fuel pumps and fuel system components, visit https://www.kemsoracing.com/.


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