Fuel Pressure Regulator: Honda Trx700xx's Secret?

The Honda TRX 700XX is an ATV (All-Terrain Vehicle) or quad bike, manufactured from 2008 to 2009. It is powered by a 686 cc, single-cylinder, 4-valve, electronically fuel-injected engine, with electric start and a 5-speed manual transmission. While there is no explicit mention of a fuel pressure regulator, the TRX 700XX does have a fuel valve located on the left side under the fuel tank, which controls the flow of fuel from the fuel tank to the fuel pump unit. Additionally, there are various aftermarket fuel tuning options available for the TRX 700XX, which can affect fuel performance and efficiency.

Fuel pump issues

The Honda TRX 700XX is an ATV (All Terrain Vehicle) or quad bike, manufactured from 2008 to 2009. It is powered by a 686 cc, single-cylinder, 4-valve, electronically fuel-injected engine with electric start and a 5-speed manual transmission.

Now, let's address some potential fuel pump issues with this model.

Firstly, some owners have reported problems with their fuel systems, specifically mentioning issues with the fuel pump, filter, and injector. One user replaced the pump with a new side-design fuel filter, but the vehicle still wouldn't start, indicating a potential issue with fuel delivery or pump pressure.

In this case, it's recommended to check the fuel pump pressure and ensure it meets the requirements of the TRX700XX. It's also worth noting that Honda changed the design of the fuel pump, so the filter's position might impact its effectiveness.

Additionally, issues with hard starts, stalling, and high RPMs at idle could be related to the fuel pump or injector. It is suggested to check the injector spray pattern and ensure it's functioning correctly. If the injector is not receiving fuel or electricity properly, it could lead to these symptoms.

Furthermore, there are aftermarket fuel pumps and fuel pump assemblies available for the TRX700XX, indicating that fuel pump issues or upgrades may be a common occurrence for this model.

When troubleshooting fuel pump issues, it's important to verify that the pump is compatible with the TRX700XX and provides the required fuel pressure and flow rate. Consulting a service manual or seeking assistance from a Honda ATV specialist is recommended to ensure proper diagnosis and repairs.

Fuel controller options

The Honda TRX 700XX is an ATV (All-Terrain Vehicle) or quad bike, manufactured from 2008 to 2009. It is powered by a 686 cc, single-cylinder, 4-valve, electronically fuel-injected engine, with electric start and a 5-speed manual transmission.

Now, let's discuss fuel controller options for the Honda TRX700XX in detail:

There are several fuel controller options available for the Honda TRX700XX, each offering different features and benefits. Here are some of the most popular choices:

Alba Racing EFI Fuel Controller

The Alba Racing EFI Fuel Controller is a popular choice for Honda TRX700XX owners. This unit plugs into your existing system without the need for cutting or splicing. Alba Racing offers two options: the standard Dobeck default fuel map and their proprietary map designed for maximum horsepower. The latter is tuned for a free-flowing open exhaust and no airbox lid with a free-flowing filter. With their years of experience, Alba Racing promises significant gains over stock. They also offer special request maps and on-site dyno tuning for the perfect tune.

EHS Racing EFI Controller

The EHS Racing EFI Controller is another option for the Honda TRX700XX. While specific details about this controller are scarce, there are discussions about its mode cycling capabilities and its effects on performance. A video demonstration was provided by a user to explain how to cycle through the modes and the basic button operations.

DMC EFI Controller

The DMC EFI Controller is a more expensive option, priced at $240. It is claimed to be mapped for the specific machine, ensuring a close match in jetting. However, some fine-tuning may still be required to achieve the optimal settings. DMC offers support and guidance for making adjustments.

LEXX EFI Controller

The LEXX EFI Controller is usually purchased alongside the LEXX slip-on exhaust. It is believed to have pre-sets specifically designed for the LEXX muffler. However, there is some debate about whether all EFI controllers with muffler brand names are the same unit with different stickers. The LEXX EFI Controller is typically priced lower than the DMC option, at around $170.

When considering fuel controller options, it is important to keep in mind that each controller may require some level of fine-tuning to match your specific vehicle configuration. Additionally, it is recommended to have a clear understanding of the controller's settings and how they impact performance. Always refer to the manufacturer's instructions and seek guidance from experts or forums when in doubt.

Fuel tuning requirements

The Honda TRX700XX is an ATV (All-Terrain Vehicle) with a 686 cc, single-cylinder, 4-valve, electronically fuel-injected engine. While the TRX700XX is no longer in production, it remains a popular choice for enthusiasts and off-road adventurers.

Fuel tuning can significantly enhance the performance of the TRX700XX, unlocking its full engine potential and improving acceleration, torque, and throttle sensitivity. This process involves adjusting the fuel mapping to increase the fuel curve setting, resulting in a more powerful and responsive ride.

There are several fuel tuning options available for the TRX700XX. One option is to install an aftermarket fuel controller, such as the Alba Racing EFI Fuel Controller, which plugs into the existing system without cutting or splicing. This controller offers a standard fuel map or a proprietary map designed for maximum horsepower, and can provide significant gains when paired with a free-flowing exhaust and filter setup.

Another option is to install a fuel tuner performance module, such as the Magnum Smart-Tune-X ATV Fuel Tuner. This device wires inline with the Manifold Absolute Temperature sensor and the lambda sensor's harness, allowing it to override the factory fuel injection settings and remap the fuel curve. This results in increased horsepower, improved throttle response, and better fuel efficiency.

It is important to note that fuel tuning requires careful adjustments and may need fine-tuning to achieve the desired results. Additionally, some fuel tuners may require technical expertise for proper installation, so it is recommended to consult a professional or seek guidance from experienced enthusiasts.

When tuning the fuel system, it is crucial to consider the potential impact on other components, especially when installing an aftermarket exhaust system. For example, installing an HMF Exhaust on the TRX700XX requires fuel tuning to prevent excessive damage to the engine and exhaust system, as well as potential warranty issues.

By understanding the fuel tuning requirements and options available, TRX700XX owners can safely enhance their ATV's performance and unlock its full potential, ensuring an even more thrilling riding experience.

Fuel valve positions

The Honda TRX700XX is an ATV (All-Terrain Vehicle) with a three-way fuel valve used to control the flow of fuel from the fuel tank to the fuel pump unit. The fuel valve is located on the left side under the fuel tank.

The three positions of the fuel valve are:

• ON: This is the normal position for riding. It allows fuel to flow from the fuel tank to the engine.
• OFF: This position is used for parking, storing, or transporting the vehicle. It stops the flow of fuel to the engine.
• RES: This position is for using extra fuel to get to a gas supply for refuelling. It allows the vehicle to use the remaining fuel in the fuel line and fuel pump canister when the main fuel tank is empty.

It is important to check that the fuel valve is in the ON position each time you refuel. If the fuel valve is left in the RES position, the vehicle may run out of fuel with no reserve.

In some cases, users have reported issues with fuel delivery, where the engine sputters, loses power, and then dies. In these cases, switching the fuel valve to the RES position temporarily resolved the issue, but it is not a permanent solution. It is recommended to check for loose connections, fuel leaks, or other problems.

Fuel injector problems

The Honda TRX 700XX is an ATV (All Terrain Vehicle) or quad bike, manufactured from 2008 to 2009. It is powered by a 686 cc, single-cylinder, 4-valve, electronically fuel-injected engine.

• Engine misfires: This can cause the motor to feel like it is sputtering and vibrating. It happens when the delicate balance between fuel and air entering the engine is disrupted.
• Rough idling: Your vehicle may sputter and shake when you're at a stop or in traffic. Rough idling is often characterised by varying RPMs even when your foot is off the gas pedal. It can also lead to engine stalling.
• Poor fuel economy: Well-functioning fuel injectors help your vehicle achieve optimal fuel efficiency. If you find yourself refuelling more often, it could be a sign of fuel injector issues.
• Unstable RPM needle: Dirty fuel injectors can cause the needle on the tachometer to move erratically, indicating changes in RPM when your car isn't shifting gears.
• Engine fails to start: Fuel injectors supply fuel to the cylinders. If they fail to do this, the engine may not receive the required air-fuel mixture for combustion, resulting in starting issues.
• Check Engine Light illuminates: A flashing or illuminated Check Engine Light could indicate a dirty or malfunctioning fuel injector, leading to insufficient or excessive fuel supply to the engine.
• Fuel leaks: Over time, heat and moisture can cause cracks in the rubber seals or the fuel injector itself, leading to fuel leaks.
• Engine performance issues: This can include symptoms such as increased fuel consumption, rough engine performance, and surging or bucking under various throttle loads.
• Smoke from the tailpipe: Visible smoke coming from the tailpipe can indicate an issue with the fuel injector, potentially due to a clogged or faulty component.
• Engine knock or detonation: This is a severe issue that can lead to catastrophic engine failure. It may be caused by faulty or clogged fuel injectors, resulting in improper fuel delivery and combustion.

Additionally, external injector leaks due to cracked injector bodies are a fire hazard and will require injector replacement.

If you suspect fuel injector problems, it is recommended to seek professional assistance for accurate diagnosis and repairs.

Frequently asked questions