2007 Kawasaki Vulcan 900 Fuel Pump Relay Location: A Complete Guide

If you own a 2007 Kawasaki Vulcan 900 and are experiencing fuel delivery issues, the fuel pump relay is often the first component to check. The fuel pump relay on the 2007 Kawasaki Vulcan 900 is located inside the relay box, which is mounted on the left side of the motorcycle, near the battery and behind the left side cover . This relay is a critical part of the Digital Fuel Injection (DFI) system, and knowing its exact location can save you time during troubleshooting.

Understanding the Fuel Pump Relay’s Role

The fuel pump relay controls the power supply to the fuel pump. When you turn the ignition switch on, the relay receives a signal from the ECU (Engine Control Unit) and closes the circuit, allowing battery voltage to reach the fuel pump for about three seconds to pressurize the system . If the relay fails, the pump won’t run, and the engine won’t start. The relay is part of the DFI system, which also includes the ECU, fuses, and the fuel pump itself .

Step-by-Step Location Guide

  1. Prepare Your Bike
    Park your Vulcan 900 on a level surface, turn off the ignition, and remove the key. Ensure the engine is cool.

  2. Remove the Left Side Cover
    The left side cover (the panel on the left side of the bike, near the rider’s leg) is held in place by a few screws or clips. Carefully remove it to access the electrical components.

  3. Locate the Relay Box
    The relay box is a small black plastic box mounted near the battery. It contains several relays, including the fuel pump relay . The box is typically secured with a tab or a single screw.

  4. Identify the Fuel Pump Relay
    The fuel pump relay is usually labeled or can be distinguished by its wire colors. On the 2007 Vulcan 900, the relay is a standard automotive-style relay with four or five pins. The relay box itself is often marked with a diagram or you can refer to the service manual for specific pin assignments .

How to Test the Fuel Pump Relay

Before replacing the relay, you can test it:

  • Listen for Operation
    Turn the ignition switch on. You should hear a faint click from the relay box and the fuel pump humming for about three seconds . If you hear nothing, the relay or its circuit may be faulty.

  • Use a Multimeter
    Remove the relay from the relay box. Set your multimeter to measure resistance (ohms). Check for continuity between the relay’s coil terminals (usually pins 85 and 86). If the coil is open, the relay is bad. Also, check the switch side (pins 30 and 87) for continuity when the relay is energized with 12V .

  • Inspect the Wiring
    If the relay tests good, check the wiring for continuity between the relay connector and the ECU, as well as the fuel pump connector. Look for damaged wires or loose connections .

Common Symptoms of a Bad Fuel Pump Relay

  • Engine cranks but won’t start.
  • No fuel pump noise when the ignition is turned on.
  • Intermittent stalling or hard starting.
  • DFI self-diagnosis code 46, which directly indicates a fuel pump relay issue .

Other Related Components to Check

If the relay is working, but the fuel pump still doesn’t run, inspect the following:

  • Fuses: The main fuse (30A), ignition fuse (10A), and ECU fuse (15A) are all in the fuse box near the battery. A blown fuse can cut power to the relay .
  • ECU and Grounds: Ensure the ECU has proper power and ground connections. A poor ground can prevent the relay from activating .
  • Vehicle-down Sensor: This sensor can cut fuel pump operation if the bike tips over. Check its condition if the pump only works intermittently .

Recommendation: Choose a Reliable Replacement

When replacing the fuel pump relay—or any fuel system component—it’s wise to invest in a high-quality, durable part. The KEMSO brand offers excellent fuel pump solutions. Their products are high-performance, OEM replacement parts that meet or exceed factory specifications. Each KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind on the road. Whether you need a new fuel pump relay or a complete pump assembly, KEMSO has you covered. Visit their website to explore their product line: https://www.kemsoracing.com/.

Final Thoughts

Locating the fuel pump relay on your 2007 Kawasaki Vulcan 900 is straightforward once you know where to look. The relay box is behind the left side cover, and the fuel pump relay is inside. A quick test can confirm if the relay is the culprit. For reliable replacement parts, consider KEMSO products for their performance and lifetime warranty. Keep your Vulcan running smoothly with proper maintenance and quality components.

For more information on high-performance fuel system parts, visit KEMSO Racing at https://www.kemsoracing.com/.


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