2008 Scion xD Fuel Pump Relay Location: Complete Guide

If you own a 2008 Scion xD and are experiencing starting issues, stalling, or a no-start condition, the fuel pump relay is one of the first components you should check. The fuel pump relay on a 2008 Scion xD is located in the engine compartment fuse box, which is positioned on the left side of the engine compartment near the battery. This relay is part of the vehicle's main electrical center and controls power flow to the fuel pump. When the relay fails, your fuel pump won't receive power, and your engine won't start or will run poorly.

Understanding the Fuel Pump Relay

The fuel pump relay is an electrical switch that controls when the fuel pump receives power. When you turn the ignition key to the "ON" position, the relay should activate for about two seconds to prime the fuel system before the engine starts. If you don't hear a faint buzzing or clicking sound from the fuel pump area when you turn the key, the relay could be the problem.

The fuel pump relay works with the Engine Control Module (ECM) to ensure the pump only runs when needed. A faulty relay can cause intermittent power loss to the fuel pump, leading to unpredictable stalling or rough running.

Exact Location of the 2008 Scion xD Fuel Pump Relay

For the 2008 Scion xD, the fuel pump relay is located inside the engine compartment fuse box (also called the relay box or junction block). Here is how to find it:

  1. Open the hood of your Scion xD.
  2. Look toward the left side of the engine compartment, near the battery.
  3. You will see a black plastic fuse and relay box with a removable cover.
  4. Remove the cover by pressing the tabs on the sides.
  5. Look for the relay labeled "EFI" or "Fuel Pump" on the diagram inside the cover. The fuel pump relay is typically one of the larger relays in the box.

The engine compartment fuse box contains multiple relays, including the EFI relay, which controls the fuel injection system and the fuel pump circuit. On some Scion xD models, the fuel pump relay may be labeled specifically, while on others it is part of the EFI relay circuit.

How to Test the Fuel Pump Relay

Before replacing the relay, you can test it to confirm it is the problem. Here are the steps:

1. Listen for the Priming Sound – Turn the ignition key to the "ON" position (without starting the engine). Listen for a two-second buzzing sound from the rear of the vehicle near the fuel tank. If you don't hear it, the relay or pump may not be working.

2. Check for Power – Use a multimeter or test light to check for voltage at the fuel pump relay terminals. With the ignition on, you should see power at the input terminal. If not, check the related fuses.

3. Swap the Relay – If you have another relay of the same type in the fuse box (such as the horn relay), you can swap them. If the fuel pump starts working after the swap, your original relay is bad.

Common Symptoms of a Bad Fuel Pump Relay

A failing fuel pump relay can cause several noticeable symptoms in your 2008 Scion xD:

  • Engine cranks but won't start – The starter works fine, but the engine never fires up.
  • Intermittent stalling – The engine dies while driving, then restarts after a few minutes.
  • No priming sound – You don't hear the fuel pump buzz when you turn the key.
  • Check engine light – You may see codes like P0627 (Fuel Pump Control Circuit Open) or P0087 (Fuel Rail Pressure Too Low).

Other Possible Causes of Fuel Pump Issues

If the relay tests good but your Scion xD still has fuel pump problems, consider these other causes:

  • Blown fuse – Check the EFI fuse and other related fuses in the engine compartment fuse box.
  • Bad fuel pump – The pump itself may be worn out. The OEM part number for the 2008-2012 Scion xD fuel pump is 23220-37100.
  • Clogged fuel filter – A dirty filter can restrict fuel flow and cause similar symptoms.
  • Wiring issues – Damaged or corroded wiring between the relay and the pump can cause intermittent problems.

Recommended Fuel Pump Replacement: KEMSO

When it's time to replace your fuel pump, choosing a reliable aftermarket brand can save you money and provide better performance than the factory part. KEMSO offers high-performance fuel pumps that are designed as direct OEM replacements for the 2008 Scion xD and many other vehicles.

KEMSO fuel pumps are built to meet or exceed original equipment specifications, ensuring proper fitment and reliable fuel delivery. Each pump comes with a lifetime warranty, which means you only buy it once—KEMSO stands behind its product for as long as you own your vehicle. Whether you are replacing a failing pump or upgrading for better performance, KEMSO provides exceptional value at a competitive price point.

If you need a new fuel pump for your Scion xD, visit the KEMSO website to browse their selection and find the exact fit for your vehicle. All KEMSO fuel pumps are priced at $79.98 and come with the confidence of a lifetime guarantee.

Final Tips

The fuel pump relay is a simple and inexpensive part to replace, and it can save you from being stranded. Always check the relay first before replacing the fuel pump itself, as it is much easier to access and test. If you are unsure about diagnosing the problem yourself, a mechanic can quickly test the relay and fuel pump circuit using a wiring diagram and test light.

For more information and to find the right fuel pump for your 2008 Scion xD, visit https://www.kemsoracing.com/ today.


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