
Cleaning a high-pressure fuel pump is a delicate task that requires careful attention to safety and detail. It is important to ensure that the fuel system is kept entirely clean to prevent premature fuel pump failure, which can be caused by contaminants such as dirt, rust, and scale. Before beginning the cleaning process, it is crucial to take safety precautions, including allowing the vehicle to cool, relieving fuel pressure, and ensuring proper ventilation in the service area to avoid the risk of fire or personal injury.
The first step is to clean the accumulated dirt from the top of the fuel tank and inspect the fuel strainer for any signs of rust, dirt, or water slime. If contaminants are found, the tank must be drained, flushed, and dried before installing a new pump. It is also important to inspect the inside of the fuel tank, as this is where the new pump will be placed, and address any rust or contamination issues.
The process of cleaning the high-pressure fuel pump involves disassembling the pump, carefully cleaning each component, and reassembling it. This includes unbolting the pump, removing the wiring harness and fuel lines, and cleaning the fuel sensors and electric motor. It is recommended to use compressed air for cleaning, but it is crucial to protect your eyes during this process.
Additionally, it is important to clean the fuel tank and inspect the fuel pump/sending unit for any signs of damage or contamination. When handling the replacement fuel pump, it is crucial to keep it in its packaging and ensure that your hands are clean to prevent introducing contaminants. Always replace the fuel strainer and the fuel tank seal when reinstalling the pump.
Overall, cleaning a high-pressure fuel pump requires a methodical and meticulous approach to ensure the pump's optimal performance and longevity.
| Characteristics | Values |
|---|---|
| Purpose of cleaning | To ensure the pump lasts its full service life |
| When to clean | Before installing a new fuel pump |
| How often to clean | Not specified |
| Time taken to clean | 1 hour |
| Safety precautions | Allow vehicle to cool, relieve fuel pressure, keep fire extinguisher nearby, avoid open flames, ventilate service area, clean up spills, disconnect negative battery terminal |
| Tools required | Fuel hand pump, container for old fuel, clean gas, rags, metric allen key set, 10 mm socket with extension, shielded fluorescent droplight |
| Steps | Remove tank, disassemble fuel pump, clean with compressed air, reassemble in reverse order |
| Additives | Atomium HPFP (restores nominal characteristics of high-pressure fuel pump) |
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What You'll Learn

Cleaning the fuel tank
Firstly, it is important to prioritise safety. Allow your vehicle to cool down before beginning any work. Relieve the fuel pressure by running the engine until it stalls, with the fuel pump fuse removed. This will prevent high-pressure fuel spray when you open the system. Make sure to turn off the ignition and disconnect the negative battery terminal. Keep a fire extinguisher nearby and ensure good ventilation in the service area.
Now, you can begin the cleaning process. Start by removing any accumulated dirt from the top of the fuel tank, especially around the pump access cover. You can use low-pressure compressed air for this task. Remember to cover the fuel inlet tubes before cleaning to avoid blowing dirt into the tank. Also, clean the tank filler pipe.
Next, remove the fuel pump/sending unit and inspect the fuel strainer for any signs of rust, dirt, or water slime. Some fuels contain alcohol, which can attract water and lead to accumulation in the tank. It is crucial to address this issue to prevent future contamination.
If the inside of the fuel tank shows signs of contamination or rust, it must be drained, flushed, and dried thoroughly before installing a new pump. In the case of rust, clean the tank and seal the inside surface. If this is not feasible, consider replacing the contaminated or rusty tank altogether.
When performing the old pump/new pump changeover, use a clean workbench and cover it with a lint-free shop towel. Ensure your hands are clean and free from any dirt or debris that could contaminate the new pump. Keep the replacement fuel pump in its packaging and the caps on the inlet and outlet fittings until you are ready to install it.
Always replace the fuel strainer, even if it appears to be in good condition. The old strainer has likely trapped contaminants that could damage the new pump. Make sure the retaining clamp fits snugly on the pump inlet to prevent contaminated fuel from bypassing the strainer.
Additionally, whenever the lock ring is removed, the fuel tank seal must be replaced. Protect the filler neck and inlet/outlet openings from dirt when reinstalling the fuel tank. Use shop towels and tape to cover any exposed openings until you are ready to reconnect the lines or hoses.
By following these steps, you can effectively clean your fuel tank and create a clean environment for your new fuel pump to function optimally. Remember, taking the time to clean your fuel tank will save you time, hassle, and money in the long run.
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Removing the fuel pump
Before removing the fuel pump, ensure you have the necessary tools and materials: a fuel hand pump, a container for old fuel, clean gas, rags, a metric allen key set, and a 10mm socket with an extension.
First, remove the small black plastic covers from the sides of the bike, followed by the seat. Grab the fuel tank stand from under the passenger seat. Next, unbolt the front of the tank and prop it with the stand. Then, unplug the wiring harness, fuel line, and the two breather lines.
At this stage, you can now unbolt the base of the tank and lift it off. It is important to empty the tank as completely as possible to get rid of any debris or contaminants.
To disassemble the fuel pump, begin by removing the heat shield from the bottom of the tank. Then, unbolt the fuel pump from the tank and carefully wiggle it out. Place the fuel pump on a clean area and ensure your hands are clean as well.
Now, you can proceed to unbolt the three wires at the base of the fuel pump. Unscrew the two spots on the sides and slide the fuel sensors off. With a firm tug, pull the whole works away from the base and set it aside.
Cleaning the High-Pressure Fuel Pump
Take your hand fuel pump and shove the push end into the hole at the bottom of the high-pressure fuel assembly. Place the suck end of the hand fuel pump into your container of clean gas. Put the high-pressure fuel assembly with the hose in a container as it's going to spray. Hold the hose in place and pump until the contaminants are gone, and the fuel coming out is clean.
Reassembly
Reassemble the fuel pump in the reverse order of disassembly. Ensure you use a crisscross pattern when tightening the fuel pump to the tank. Put clean fuel back into the tank or filter the fuel you removed earlier and put it back.
Safety Precautions
When working on the fuel pump, it is crucial to take safety precautions. Allow the vehicle to cool before beginning any work. Relieve the fuel pressure by running the engine until it stalls with the fuel pump fuse removed. This prevents high-pressure fuel spray and reduces the risk of fire or injury.
Disconnect the negative battery terminal and keep a Class B/C fire extinguisher nearby. Do not smoke, and avoid open flames. Use a shielded fluorescent droplight instead of an incandescent bulb, and ensure it is on a circuit protected by a maximum 20-amp fuse.
Clean up any fuel spills immediately and properly dispose of fuel-soaked rags and absorbents to minimize fire hazards.
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Cleaning the fuel pump
Prepare the Vehicle:
- Allow the vehicle to cool down before beginning any work.
- Relieve the fuel pressure by running the engine until it stalls with the fuel pump fuse removed. This prevents high-pressure fuel spray when hose fittings are opened.
- Turn off the ignition and disconnect the negative battery terminal.
- Ensure you have a Class B/C fire extinguisher nearby and avoid any smoking or open flames. Ventilate the area and clean up any fuel spills immediately.
- Use a shielded fluorescent droplight for lighting.
Clean the Fuel Tank:
- Remove any accumulated dirt from the top of the fuel tank, especially around the pump access cover. You can use low-pressure compressed air for this step.
- After removing the fuel hoses from the pump assembly, cover the fuel inlet tubes to prevent dirt from entering the tank.
- Inspect the fuel strainer for any signs of rust, dirt, or water slime. If the strainer appears contaminated, the tank must be drained, flushed, and dried before proceeding.
- If the inside of the tank is rusted, it must be cleaned and sealed. If this is not feasible, the tank should be replaced.
Remove and Clean the Fuel Pump:
- Place a lint-free shop towel on your workbench and carefully remove the pump/sending unit combination.
- Ensure your hands are clean and have not come into contact with any dirt during the removal process.
- Keep the new fuel pump in its packaging until you are ready to install it.
- When installing the new pump, keep the caps on the inlet and outlet fittings.
- Always replace the fuel strainer, even if the old one appears clean.
- Ensure the retaining clamp fits snugly on the pump inlet to prevent contaminated fuel from bypassing the strainer.
Reinstall the Fuel Tank:
- Anytime the lock ring is removed, the fuel tank seal must be replaced.
- Protect the filler neck and inlet/outlet openings from dirt when reinstalling the fuel tank. Use shop towels and tape to cover any exposed openings.
- If any fuel hoses are replaced, ensure you use high-pressure hose marked SAE R-7 or higher for high-pressure fuel injection systems.
Final Checks:
- Always check for fuel leaks before returning the vehicle to operation.
- Consider using a fuel additive to restore the nominal characteristics of the high-pressure fuel pump and improve its performance.
By following these steps, you can effectively clean your fuel pump and help ensure the longevity and proper functioning of your vehicle's fuel system.
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Reassembling the fuel pump
Now that you have cleaned the high-pressure fuel pump, it is time to reassemble the pump and put everything back together.
Firstly, place the electric motor back into the plastic holder, ensuring that you clip it securely into place. Next, slide the fuel sensors back onto the assembly and screw them into place. Then, bolt the three wires back onto the base of the fuel pump. After this, you can place the fuel pump back into the tank, ensuring that you bolt it securely. Now, you can bolt the fuel pump and the heat shield back onto the tank.
Next, reconnect the wiring harness, the fuel line, and the two breather lines. After this, bolt the base of the tank back into place and lower it down. Reconnect the fuel tank stand and place the seat back onto the bike. Finally, you can replace the small black plastic covers on the sides of the bike.
Now that you have reassembled the fuel pump and the rest of the bike, you are almost ready to test it out. Remember to put clean fuel back into the tank or filter the fuel you took out and put it back in. Once you have done this, start the bike and go for a ride. Everything should be working well, and you can enjoy your newly cleaned high-pressure fuel pump!
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Flushing the fuel system
Step 1: Identify the Need for Flushing
Before you begin, it's important to understand the warning signs that indicate a problem with your fuel system. These can include rough engine starting, shuddering while idling, losing power when driving uphill or downhill, and slow engine response when you press the accelerator. If you notice any of these issues, it's time to flush your fuel system.
Step 2: Prepare the Necessary Tools and Materials
Gather all the tools and materials you'll need for the job. This includes a fuel hand pump, a container for the old fuel, clean fuel (as clean as possible), rags for cleanup, and the appropriate tools such as Allen keys and sockets.
Step 3: Remove the Fuel Tank
Start by removing the small black plastic covers from the sides of the bike, followed by the seat. Then, grab the fuel tank stand from under the passenger seat. Unbolt the front of the tank and prop it with the stand. Unplug the wiring harness, fuel line, and breather lines. Finally, unbolt the base of the tank and lift it off.
Step 4: Disassemble the Fuel Pump
Take off the heat shield from the bottom of the tank. Unbolt the fuel pump from the tank and carefully wiggle it out. Place the fuel pump on a clean surface and unbolt the wires at the base. Unscrew the spots on the sides and slide off the fuel sensors. You can now remove the electric motor and access the high-pressure fuel filter.
Step 5: Clean the High-Pressure Fuel Pump
Using your hand fuel pump, insert the push end into the hole at the bottom of the high-pressure fuel assembly. Place the suck end of the pump into your clean fuel container. The high-pressure fuel assembly will spray fuel, so hold the hose in place and pump until the contaminants are gone. The fuel should be coming out of the rubber-lined hole.
Step 6: Reassemble the Components
After cleaning, it's time to reassemble the components. Put everything back together in the reverse order of disassembly. Make sure to tighten the bolts in a criss-cross pattern when reattaching the fuel pump to the tank.
Step 7: Refill with Clean Fuel
Once everything is reassembled, refill the tank with clean fuel or filter the fuel you removed earlier to ensure it's clean. Start the engine and take the vehicle for a test drive.
Additional Tips:
- It is recommended to clean your fuel tank and fuel pump regularly to maintain optimal performance and prevent damage.
- Always exercise caution when working with fuel and flammable liquids. Ensure proper ventilation and avoid open flames or sparks.
- If you are unsure about any part of the process, it is best to consult a professional technician for assistance.
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Frequently asked questions
To clean a high-pressure fuel pump, you will need to remove the pump from the fuel tank and disassemble it. Use compressed air to blow out any debris, and clean all components with a suitable cleaning solution. Ensure you work in a well-ventilated area and take appropriate safety precautions to avoid any risks associated with the flammable nature of fuel, such as keeping a fire extinguisher nearby.
If your engine is stuttering, cutting out, or lacking power, this could be a sign that your high-pressure fuel pump is clogged or damaged and needs cleaning or replacing.
It is recommended to clean your fuel pump and tank every time you replace the pump. The time and effort spent cleaning your fuel system will save you from potential future issues and will extend the life of your pump.
A clean fuel pump will ensure your engine runs efficiently and could save you money on fuel. A clean pump will also reduce the risk of damage to other components in your engine.











































