how to check fuel pump on harley davidson

Checking the fuel pump on a Harley-Davidson motorcycle typically involves verifying that the fuel pump is delivering an adequate and consistent flow of fuel to the engine. Here are the steps to check the fuel pump on a Harley-Davidson:

Materials You’ll Need:

  • Harley-Davidson service manual (specific to your motorcycle model and year)
  • Safety glasses
  • A clean container for fuel drainage (if needed)
  • Fuel pressure gauge (if available)
  • Basic hand tools (wrenches, pliers)
  • Fuel hose and clamps (if needed)


  1. Safety Precautions:
    • Ensure that you are working in a well-ventilated area, preferably outdoors or in a well-ventilated garage.
    • Wear safety glasses to protect your eyes from fuel splashes.
    • Make sure the motorcycle’s ignition is turned off.
  2. Consult the Service Manual:
    • Refer to your Harley-Davidson service manual for specific instructions related to your motorcycle’s fuel pump, fuel system, and troubleshooting procedures. The manual will provide detailed information about the fuel pump location and testing methods.
  3. Locate the Fuel Pump:
    • Depending on the Harley-Davidson model, the fuel pump may be located in different areas, such as inside the fuel tank or externally. Consult your service manual to locate the fuel pump on your specific model.
  4. Check Fuel Pump Fuse and Relay (if applicable):
    • If your motorcycle has a fuse and relay for the fuel pump, ensure they are in good condition and functioning correctly. Replace any blown fuses or faulty relays.
  5. Inspect Fuel Lines and Connections:
    • Inspect the fuel lines for any signs of damage, leaks, or blockages. Replace any damaged or deteriorated fuel lines.
    • Check the fuel pump’s electrical connections for loose or corroded wires. Make sure they are securely connected.
  6. Check Fuel Pressure (if you have a fuel pressure gauge):
    • If you have access to a fuel pressure gauge and your motorcycle’s service manual provides fuel pressure specifications, connect the gauge to the fuel system according to the manual’s instructions.
    • Turn on the motorcycle’s ignition without starting the engine. The fuel pressure gauge should register the specified pressure.
    • Compare the reading to the specifications in your service manual. If the pressure is too low or too high, it may indicate a fuel pump problem.
  7. Listen for Fuel Pump Operation:
    • Turn the ignition key to the “On” position (but do not start the engine).
    • Listen for the sound of the fuel pump priming. Most Harley-Davidson motorcycles have a distinctive whirring sound when the fuel pump is operating correctly. If you don’t hear this sound, it may indicate a fuel pump issue.
  8. Verify Fuel Delivery (if needed):
    • In some cases, you may need to disconnect the fuel line from the fuel pump and direct it into a clean container.
    • Turn on the ignition to prime the pump. Fuel should flow steadily into the container. If fuel flow is weak or nonexistent, it suggests a problem with the fuel pump or the fuel filter.
  9. Consult a Professional Mechanic:
    • If you’ve performed these checks and suspect a problem with the fuel pump, it’s advisable to consult a Harley-Davidson dealership or a qualified motorcycle mechanic for further diagnosis and repairs.

Remember that Harley-Davidson motorcycles can vary significantly in terms of their fuel systems and configurations, so the specific procedures and fuel pressure specifications may differ between models and years. Always refer to your motorcycle’s service manual for the most accurate information and follow safety precautions throughout the process.

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