Harley Davidson’s continue to be a symbol of freedom and adventure for riders around the world. One common issue that riders may face, however, is the Harley Davidson fuel pump not coming on when it’s supposed to. This can easily lead to a whole bunch of problems and frustration, effectively grounding a motorcycle until the issue is resolved.
In order to troubleshoot this issue, it’s important to understand the normal process for the fuel pump to engage. Typically, when the ignition switch is turned to the “on” position, the fuel pump should prime, providing fuel to the engine. If this isn’t happening, riders should explore potential causes and solutions to get their motorcycle back on the road.
Some common factors leading to Harley Davidson fuel pump not coming on include problems with the ignition switch, fuses, relays, or batteries. By identifying the root cause and employing proper solutions, riders can ensure their motorcycle remains reliable and safe to ride.
Symptoms of a Harley Davidson Fuel Pump Not Coming On
There are several symptoms that indicate a potential issue with your Harley Davidson fuel pump not coming on. Being aware of these can help you diagnose the problem and take appropriate action. Here are some common symptoms:
No noise from the fuel pump
A fuel pump with no issues should produce a low buzzing sound when the ignition is turned on. If you don’t hear this sound, it could indicate a problem with the fuel pump or its electrical connections.
Whining noises from the fuel tank
While a low buzzing sound is normal, a high-pitched whining sound from the fuel tank suggests an issue with the fuel pump. This could be cause by a number of reasons, such as contaminated fuel or a malfunctioning pump.
Reduced performance or power
If your motorcycle’s engine is not supplied with adequate fuel, it can result in poor performance, reduced power, or even stalling. This might indicate a problem with the fuel pump, filter, or related components.
Inconsistent power delivery
A failing fuel pump may not consistently deliver the appropriate amount of petrol to the engine, leading to power fluctuations, a problem that is more apparent at higher speeds or under load.
By keeping an eye out for these symptoms, you can better diagnose issues with your Harley Davidson’s fuel pump and take appropriate measures to rectify them. Remember that it’s always a good idea to consult a professional mechanic if you suspect any issues with your motorcycle’s fuel system.
Common Causes for the Harley Davidson fuel pump not coming on
One of the first things to check when a Harley Davidson fuel pump is not coming on is the electrical connections. Loose, corroded, or damaged wiring can interrupt the power supply to the fuel pump, preventing it from operating. Check the wiring and connectors for the fuel pump and ensure they are securely connected and in good condition.
Fuel Pump Relay
A faulty fuel pump relay is another common cause of the fuel pump not coming on in a Harley Davidson motorcycle. The relay is responsible for engaging the fuel pump when the ignition is turned on. If the relay is malfunctioning, it may fail to send the necessary electrical signal to the pump. This issue can be addressed by testing the relay for proper functioning and replacing it if necessary.
Fuel Pump Fuse
The fuel pump fuse is another crucial component that could cause the fuel pump not to come on. A blown or damaged fuse interrupts the electrical flow to the pump. In some cases, replacing the blown fuse may resolve the issue. However, it is essential to identify any underlying problems that may have caused the fuse to blow in the first place, such as a short circuit or excessive current draw.
Fuel Pump Itself
Sometimes the fuel pump itself may be the cause of the issue. Fuel pumps can wear out or get damaged over time, leading to insufficient fuel supply for the engine. Checking the fuel pump for proper operation can help determine if it needs to be replaced. Symptoms like no fuel pump noise or weak fuel flow might indicate a problem with the pump itself.
Below are some of the key steps you need to go through when diagnosing what the problem is when the Harley Davidson fuel pump not coming on.
Inspecting Electrical Connections
To begin, visually inspect the electrical connections to the fuel pump. Ensure that all connectors are clean, tight, and free of corrosion. If any connections seem loose or damaged, they should be repaired or replaced.
Testing the Fuel Pump Relay
Next, test the fuel pump relay by locating it in your bike’s fuse box. To check the relay, remove and install a known working relay in its place. If the fuel pump starts working with the replacement relay, it indicates that the original relay is faulty and should be replaced.
Checking the Fuel Pump Fuse
Another step in troubleshooting a Harley Davidson fuel pump that’s not coming on is checking the fuel pump fuse. This can be done by following the fuse diagram in your bike’s owner’s manual or checking the fuse box under the side cover.
Remove the fuse, thoroughly examine it for any signs of damage or burning. If the fuse is damaged, you can simply replace it with a new one. Remember to also ensure that all fuses related to the fuel system are in good condition.
Examining the Fuel Pump
Lastly, examine the fuel pump itself for any signs of damage or wear. Remove the fuel pump by following the recommended procedure in your bike’s service manual. Inspect the fuel pump for any wear or tear, and listen for any abnormal sounds while the pump is operating. If the fuel pump is faulty, it may need to be replaced.
By following these troubleshooting steps, you can help determine the cause of your Harley Davidson’s fuel pump not coming on and make the necessary repairs.
Replacing the Fuel Pump
When a Harley Davidson fuel pump not coming on, you may need to replace it to restore proper function. In this section, we will discuss the process of replacing the fuel pump, including the tools and materials you’ll need and a step-by-step guide.
Required Tools and Materials
Before you begin, gather the following tools and materials:
- Wrench set
- New fuel pump
- Socket set
- Replacement fuel filter
- Container for fuel drainage
- First, disconnect the battery and remove the fuel pump fuse to relieve pressure in the fuel system. This can be done by opening the fuse box and removing the fuel pump fuse. Start the engine to relieve fuel pressure, and it will stall within a few seconds as it runs out of fuel.
- Next, remove the saddlebag and side cover on the motorcycle to access the fuel pump.
- Remove the fuel tank by disconnecting the fuel lines, vent lines, and electrical connections. You may need to use a container to drain any remaining fuel.
- Once the fuel tank is removed, remove the fuel pump assembly from the tank. This includes the pump and the fuel filter. Replace the old fuel pump with the new one and also replace the fuel filter as necessary.
- Reinstall the fuel pump assembly back into the fuel tank, ensuring all seals are properly seated and connections are secure.
- Put the fuel tank back onto the motorcycle, reconnecting the fuel lines, vent lines, and electrical connections.
- Reinstall the saddlebag and side cover. Reconnect the battery and the fuel pump fuse.
- Start the engine and check for proper operation of the new fuel pump. Make sure there’s no leaks or other issues.
By following this guide, you should be able to successfully replace the fuel pump on your Harley Davidson motorcycle and restore its performance.
Preventative Maintenance Tips
Regular maintenance is crucial for ensuring the longevity and optimal performance of your Harley Davidson’s fuel pump. By implementing these preventative measures, you can minimize the likelihood of encountering fuel pump issues.
First and foremost, it is essential to periodically check and replace the fuel filter. A clogged fuel filter can strain the pump, leading to various problems. Inspect the fuel filter and replace it if required, following the recommended mileage or time intervals specified in the owner’s manual.
Another key tip is to inspect the electrical connections and relays related to the fuel pump, as these can occasionally become corroded or loose. Check the and relay for any damage or signs of wear, and replace them if necessary.
Additionally, pay attention to the fuel level in the tank, as consistently riding with low fuel can lead to premature fuel pump failure. A low fuel level can cause the pump to overheat, as the fuel acts as a coolant. Make a habit of filling the tank regularly to prevent this issue from arising.
Maintaining the cleanliness of the fuel system is also important. Use a fuel system cleaner periodically, as recommended in your owner’s manual, to remove any build-up and contaminants from the system.
Lastly, be aware of any unusual sounds or performance issues when starting the motorcycle or while riding. Early detection of potential fuel pump problems can help prevent further damage and costly repairs. If you notice any irregularities, consult a qualified technician to diagnose and address the issue before it worsens.
Verdict On the Harley Davidson Fuel Pump Not Coming On
In conclusion, there are several reasons why the Harley Davidson fuel pump not coming on. Some common causes include a faulty fuel pump relay, issues with the run switch, or a defective fuel pump itself. Additionally, the problem might also arise due to weak batteries and improperly wired aftermarket equipment.
Identifying the root cause of the issue is crucial to effectively troubleshoot and fix the problem. Before jumping to conclusions, it’s essential to test key components such as the fuel pump relay, run switch, and battery voltage. Invest time in conducting proper diagnostic tests to ensure the correct issue is being addressed.
Moreover, keep in mind that proper maintenance of your Harley Davidson motorcycle is vital for the longevity and performance of components, including the fuel pump system. Regularly check and clean the electrical connections to avoid issues arising from poor connections or corrosion. By staying proactive with maintenance, you can prevent fuel pump problems and enjoy a reliable, smooth ride on your Harley Davidson motorcycle.