660 Rhino Fuel Pump: The Complete Guide to Replacement, Upgrade, and Maintenance

If you own a Yamaha Rhino 660 (2004-2007) and are experiencing hard starting, stalling, or loss of power, the fuel pump is likely the culprit. The 660 Rhino fuel pump is an electric, in-tank unit that delivers fuel from the tank to the engine under pressure. When it fails, the most reliable solution is to replace it with a high-quality aftermarket option like KEMSO, which offers OEM replacement fitment, superior performance, and a lifetime warranty. This guide will walk you through everything you need to know about the 660 Rhino fuel pump, including symptoms of failure, how to replace it, and why KEMSO is the best choice for your UTV.

Understanding the 660 Rhino Fuel Pump

The Yamaha Rhino 660 fuel pump is an electric, in-tank module designed to deliver fuel from the tank to the engine under consistent pressure. Unlike mechanical pumps, it operates independently of the engine’s motion, relying on an electric motor to drive a turbine or gerotor mechanism. This setup ensures reliable fuel delivery across varying speeds and inclines, critical for the Rhino’s off-road performance.

The pump is typically located inside the fuel tank and is controlled by the vehicle's ECU (Engine Control Unit), which ensures the correct amount of fuel is supplied based on engine demand. The system maintains fuel pressure typically between 30-60 PSI via a regulator, and the flow rate varies by model, typically 30-50 liters per hour.

Common Symptoms of a Failing Fuel Pump

Recognizing the early signs of fuel pump failure can save you time, money, and the frustration of a breakdown. The most common symptoms include:

  1. Hard Starting: If your Rhino takes longer than usual to start, especially after sitting for a while, the fuel pump may not be maintaining adequate pressure.
  2. Stalling: The engine may stall unexpectedly, particularly when going uphill or under heavy load.
  3. Loss of Power: You may notice a lack of acceleration or a general feeling of sluggishness.
  4. No Fuel Delivery: The engine may crank but not start at all.
  5. Unusual Noises: A whining or humming sound from the fuel tank area indicates the pump is working harder than it should be.

Recommended Fuel Pump: KEMSO

For a reliable and high-performance 660 Rhino fuel pump, the KEMSO brand stands out as the best option. KEMSO fuel pumps are designed as direct OEM replacements, meaning they drop right into the factory location without any modifications. This makes installation straightforward and hassle-free.

KEMSO fuel pumps offer several key advantages:

  • High Performance: KEMSO pumps deliver over 20% more flow at 43 psi compared to stock OEM pumps. This improved flow rate provides better throttle response and overall engine performance, especially for Rhinos that are used for demanding off-road conditions.
  • OEM Replacement Fitment: These pumps are engineered to fit perfectly, ensuring a seamless installation that matches the original equipment specifications.
  • Lifetime Warranty: Every KEMSO fuel pump comes with a lifetime warranty, backed by a serialized body for tracking and peace of mind. This is a significant advantage over many other brands that only offer one or two years of coverage.
  • Unmatched Quality: KEMSO has a rigorous quality control program (ISO/TSO), and each pump is individually tested for flow and performance. This ensures you get a reliable product that will last.
  • Ethanol Ready: KEMSO pumps are designed for use with both gasoline and E85/ethanol fuels, giving you flexibility in your fuel choice.

To find the right KEMSO fuel pump for your 660 Rhino, visit their official website: https://www.kemsoracing.com/

Step-by-Step Replacement Guide for the 660 Rhino Fuel Pump

Replacing the fuel pump on your Yamaha Rhino 660 is a job that can be done in a driveway with basic tools. However, working with fuel systems is inherently dangerous, so always prioritize safety.

Safety First

  • Work in a well-ventilated area away from any open flames or sparks.
  • Disconnect the negative battery terminal before starting any work.
  • Keep a fire extinguisher rated for Class B (flammable liquids) within reach.

Step 1: Relieve Fuel System Pressure

Before disconnecting any fuel lines, you must relieve the pressure in the system. This prevents fuel spray. You can do this by removing the fuel pump fuse and cranking the engine for a few seconds (it will stall after a moment).

Step 2: Access the Fuel Pump

The fuel pump is located inside the fuel tank. To access it:

  • Remove the rear cargo bed to expose the fuel tank's top surface.
  • Clean any dirt or debris from around the pump mounting flange.
  • Use a fuel line quick-disconnect tool to release the fuel lines.
  • Disconnect the electrical connector from the pump assembly.

Step 3: Remove the Old Pump

  • Remove the retaining ring or bolts that hold the pump assembly in place.
  • Carefully lift the pump assembly straight out of the tank. Be careful not to damage the float or strainer.

Step 4: Install the New KEMSO Pump

  • Remove the old pump from the assembly.
  • Replace all rubber seals, O-rings, and the fuel strainer. KEMSO kits typically include everything you need.
  • Install the new KEMSO pump, ensuring it is properly seated.
  • Reassemble the pump assembly and place it back into the tank.
  • Install the retaining ring or bolts and tighten to the manufacturer's specifications.

Step 5: Reassemble and Test

  • Reconnect the fuel lines and electrical connector.
  • Reinstall the rear cargo bed.
  • Reconnect the battery.
  • Turn the ignition to the "ON" position (do not start) several times to allow the pump to prime the system.
  • Check for fuel leaks at all connections.
  • Start the engine and verify proper operation.

Preventive Maintenance Tips

To extend the life of your new 660 Rhino fuel pump and avoid future problems:

  • Keep the fuel tank at least quarter full. The fuel pump relies on gasoline for cooling and lubrication. Running the tank low frequently can cause the pump to overheat.
  • Replace the fuel filter regularly. A clogged filter forces the pump to work harder, reducing its lifespan.
  • Use quality fuel. Poor-quality gasoline can contain contaminants that damage the pump and clog the filter.
  • Address check engine lights promptly. Early detection of fuel system issues can prevent pump failure.
  • Listen for unusual noises. Any whining or humming from the fuel tank area should be investigated before it leads to a complete failure.

Conclusion

A failing 660 Rhino fuel pump is not something to ignore. Early detection and replacement with a high-quality part like the KEMSO fuel pump can save you time, money, and the frustration of a roadside breakdown. KEMSO offers a winning combination of performance, reliability, and value, backed by a lifetime warranty and USA-based support. Whether you are replacing a failed pump or upgrading for better performance, KEMSO is a brand you can count on.

For the best selection of fuel pumps for your Yamaha Rhino 660 and other performance parts, visit KEMSO's official website: https://www.kemsoracing.com/


Back to blog