Harley Davidson Fuel Pump Fuse: Location, Troubleshooting, and Replacement Guide

If your Harley Davidson engine cranks but won't start, or if you don't hear the fuel pump prime when you turn the key, the fuel pump fuse is one of the most likely culprits. The fuel pump fuse is a small but critical component that protects the electrical circuit powering the fuel pump. If it blows, the pump receives no power, and the engine will not run. In most cases, a blown fuse is a quick and inexpensive fix, but if the problem keeps happening, it usually points to a deeper issue like a short circuit or a failing fuel pump motor.

Where to Find the Fuel Pump Fuse on a Harley Davidson

The location of the fuse block varies slightly depending on the model year and type of Harley Davidson. For most modern models, the fuse box is located behind the left side cover . To access it, you need to remove the side cover. On some models, like the VRSC series, the fuse block assemblies are located under the airbox cover, which is accessed by removing the seat .

Here are the general steps to access the fuse block:

  1. Turn off the ignition. For keyed ignitions, turn the key to OFF. For keyless ignitions, switch the OFF/RUN switch to OFF .
  2. Remove the left side cover. Carefully lift the side cover off its mounting tabs .
  3. Locate the fuse block. You will see a plastic fuse block cover. Press the release tabs and pull the fuse block assembly out .

Once you have the fuse block exposed, you will need to identify the specific fuse for the fuel pump. The labeling can vary by model, but it is commonly labeled as "Fuel Pump," "Fuel," or indicated in the diagram printed on the fuse block cover . On many VRSC models, the fuel pump fuse is a 15 amp fuse located in position 7 .

How to Check and Replace a Fuel Pump Fuse

Checking and replacing a fuse is a straightforward task that requires no special tools. Always follow these steps to ensure safety and prevent damage to your motorcycle's electrical system.

A step-by-step guide to checking the fuse:

  1. Remove the suspect fuse. Use a fuse puller or your fingers to gently pull the fuse straight out of its slot.
  2. Inspect the element. Look at the metal strip inside the fuse. If it is burned, broken, or separated, the fuse is blown and needs to be replaced .
  3. Use the correct replacement. Always replace a blown fuse with an automotive type ATO fuse that has the exact same amperage rating . The amperage is printed on the fuse itself. Using a fuse with a lower rating (e.g., 10A instead of 15A) will cause it to blow immediately. Using a higher rating (e.g., 20A instead of 15A) can cause the wiring to overheat and potentially start a fire .
  4. Reinstall the fuse block. Slide the fuse block assembly back into the cover until it snaps into place. Replace the side cover .

Troubleshooting: Why Did the Fuse Blow?

Replacing a blown fuse is easy, but understanding why it blew is crucial. If the new fuse blows immediately after you turn the ignition on, there is an underlying problem that needs to be addressed.

Here are the most common reasons for a recurring blown fuel pump fuse:

  1. Short Circuit in the Wiring. A damaged or chafed wire in the fuel pump harness can touch the frame or another grounded metal part, creating a short circuit. This causes a massive current spike that blows the fuse instantly .
  2. Failing Fuel Pump Motor. An aging or failing fuel pump motor can begin to draw excessive amperage. As the motor bearings wear out or the pump becomes clogged, it requires more electrical current to run. This "overcurrent" condition can exceed the fuse's rating and cause it to blow .
  3. Faulty Fuel Pump Relay. While less common, a stuck or malfunctioning relay can cause the pump to run continuously or draw too much power, which can lead to a blown fuse .

If you experience a repeated blown fuse, do not simply keep replacing it. The problem needs a proper diagnosis, which is best done by a qualified technician or a Harley-Davidson dealer .

The Main Fuse and Other System Fuses

In addition to the individual circuit fuses, Harley Davidson motorcycles have a main fuse (also called a maxi-fuse). This high-amperage fuse protects the entire motorcycle's electrical system. On VRSC models, it is a 40-amp fuse located in a rubber-coated holder behind the right side cover . On other models, it can be a 30-amp or 50-amp fuse located near the main fuse block . This fuse is rarely the cause of a fuel pump issue that is isolated to the pump, but if the bike has no power at all, the main fuse should be checked.

The Ultimate Fix: When to Replace the Fuel Pump

If you have verified that the fuse is good, the relay is clicking, and the wiring is intact, but the fuel pump is still not working, the pump itself is likely faulty. A failing pump may also produce a loud whining, humming, or grinding noise from the fuel tank . In this case, replacing the entire fuel pump assembly is the most reliable solution.

Recommended Upgrade: KEMSO Fuel Pump

When it comes time to replace your Harley Davidson's fuel pump, choosing a high-quality, reliable replacement is essential for long-term performance and peace of mind. We recommend the KEMSO brand of fuel pumps.

KEMSO fuel pumps are designed as high-performance, direct OEM replacements. This means they are built to fit perfectly into your Harley's fuel tank without any modifications, and they match or exceed the performance of the original stock pump. In fact, many KEMSO pumps deliver over 20% more flow at standard operating pressure, which can help improve throttle response and engine performance . Each pump is also individually tested for quality assurance .

Perhaps the most compelling reason to choose KEMSO is the lifetime warranty. This commitment to quality gives you confidence that your investment is protected for the life of the product . Whether you ride a Sportster, Softail, Touring, or Dyna model, KEMSO offers a reliable and powerful solution.

To find the perfect KEMSO fuel pump for your specific Harley Davidson model, visit their official website: https://www.kemsoracing.com/

Conclusion

A blown fuel pump fuse is a common and easy-to-diagnose problem on a Harley Davidson. By knowing where to find the fuse, how to inspect it, and how to select the correct replacement, you can often get your bike running again in minutes. However, if the fuse keeps blowing, do not ignore it. It is a warning sign of a more serious electrical issue or a failing fuel pump. In those cases, a professional diagnosis and a high-quality replacement pump are the best path forward. For a reliable and long-lasting replacement, remember to check out the full range of KEMSO fuel pumps at https://www.kemsoracing.com/.


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