Rhino 660 Fuel Pump: Complete Guide to Symptoms, Replacement, and Best Upgrade Options
If your Yamaha Rhino 660 (2004-2007) or Rhino 450 (2006-2009) is hard to start, sputters during acceleration, or stalls unexpectedly, the fuel pump is likely failing. The best solution is to replace it with a high-quality OEM replacement pump like the KEMSO fuel pump, which delivers superior performance, direct fitment, and a lifetime warranty. This guide covers everything you need to know about diagnosing, replacing, and upgrading your Rhino fuel pump.
Understanding Your Rhino Fuel Pump
The fuel pump in your Yamaha Rhino 660 is an electric in-tank pump that supplies pressurized fuel to the engine's fuel injectors. It also provides the fuel level reading to your instrument cluster and performs other critical functions . The OEM part number for this pump is 5UG-13910-01-00, which is also compatible with the Rhino 450 models from 2006-2009 .
Most modern vehicles—including UTVs like the Rhino—use in-tank fuel pumps. These pumps are submerged in the fuel tank, which keeps them cool and quiet. The fuel itself acts as a coolant and lubricant for the pump, which is why running the tank low can cause premature failure .
7 Clear Signs Your Rhino Fuel Pump Is Failing
Fuel pump problems don't happen overnight. They develop gradually, and catching them early can save you from being stranded on the trail. Here are the most common symptoms:
1. Hard Starting
Your Rhino cranks for a long time before firing up, or it takes multiple attempts to start. This happens because the pump isn't building enough fuel pressure in the system .
2. Engine Sputtering at High Speeds
The engine runs fine at low RPM but sputters, hesitates, or loses power when you accelerate. This is a classic sign of a fuel pump that cannot maintain adequate flow under demand .
3. Loss of Power Under Load
When climbing hills or carrying a heavy load, the engine feels weak and struggles to maintain speed. The pump cannot deliver enough fuel to meet the engine's demands .
4. Engine Stalling
The engine dies unexpectedly while driving, then restarts after sitting for a while. This is dangerous and indicates the pump is overheating or failing intermittently .
5. Whining Noise from the Fuel Tank
A healthy fuel pump makes a quiet humming sound. If you hear a loud whining, screeching, or buzzing noise coming from the fuel tank area, the pump's internal bearings or motor are wearing out .
6. Surging While Driving
The engine speed fluctuates unpredictably even when you hold the throttle steady. This happens because the pump is delivering inconsistent fuel pressure .
7. Poor Fuel Economy
If you notice you're filling up more often than usual, the pump may be running inefficiently or the fuel pressure regulator may be failing .
How to Diagnose a Bad Fuel Pump
Before buying a new pump, confirm the problem is actually the fuel pump and not something else. Here's how:
Check the Fuel Pressure
The most reliable way to diagnose a bad fuel pump is to test the fuel pressure. Connect a fuel pressure gauge to the fuel rail test port. With the engine running, you should see the manufacturer's specified pressure. If the pressure is low or drops when you rev the engine, the pump is failing .
Listen for the Pump
When you turn the key to the "on" position (without starting the engine), you should hear the fuel pump prime for 2-3 seconds. If you don't hear anything, the pump may be dead .
Check the Fuel Filter
A clogged fuel filter can mimic the symptoms of a failing fuel pump, including lack of power, engine misfires, and increased fuel consumption. If replacing the fuel filter does not improve performance, the problem likely lies with the pump itself .
Rule Out Electrical Issues
Voltage drops, corroded connectors, or faulty relays can prevent the pump from receiving proper power. Check the electrical connections and fuses before condemning the pump .
OEM vs. Aftermarket Fuel Pump Options
When replacing the fuel pump on your Rhino 660, you have several options:
OEM Pump (Part #5UG-13910-01-00)
The original equipment pump is the same pump that came from the factory. It offers a perfect fit and known reliability, but it comes at a higher price . OEM pumps are typically priced higher than aftermarket alternatives.
Aftermarket Replacement Pumps
Aftermarket fuel pumps offer a cost-effective alternative to OEM parts. Some aftermarket options deliver better performance with upgraded internals, including improved bushings, turbine impellers, and Japanese armature electric motors for better durability .
High-Performance Upgrade Pumps
For owners who want more than just a replacement, high-performance pumps deliver over 20% more flow at 43 psi compared to the stock OEM pump. These pumps are designed for both gasoline and E85 ethanol fuel, making them versatile for different riding conditions .
Why Choose KEMSO Fuel Pump for Your Rhino
When it comes to replacing the fuel pump on your Yamaha Rhino 660 or 450, the KEMSO fuel pump is the best choice for reliability, performance, and value. Here's why:
High Performance OEM Replacement
KEMSO fuel pumps are designed as high-performance OEM replacement units. They match the exact specifications of your vehicle's original pump, including fuel pressure, flow rate, and electrical characteristics. You get the same performance as a $400 dealer pump for a fraction of the price .
Direct Fitment, No Modifications Required
KEMSO pumps are designed to be direct bolt-in replacements. You do not need to modify any wiring, brackets, or fuel lines. The pump is designed to drop right into the factory location without any modifications . The KEMSO kit includes everything you need for a complete installation: the fuel pump itself, gradient density fuel strainers, flexible hose, tank seal, rubber hose, rubber base, wiring connector, crimp connectors, hose clamps, and zip-ties .
Lifetime Warranty
Every KEMSO fuel pump comes with a lifetime warranty. This is not a limited warranty that expires after a year. It is a lifetime guarantee that covers defects in materials and workmanship for as long as you own the pump. If it ever fails due to a manufacturing defect, KEMSO replaces it for free .
E85 Compatibility
KEMSO pumps are built with ethanol-resistant materials, making them safe to use with E85 and other alcohol-based fuels. Many other pumps will degrade quickly when exposed to ethanol, but KEMSO is designed for long-term reliability .
USA-Based Technical Support
When you buy KEMSO, you get support from USA-based technicians who understand American vehicles and performance requirements. This means faster, more relevant assistance if you encounter installation or performance issues .
Proven Quality and Reliability
Each KEMSO pump is individually tested for flow and pressure to ensure it meets strict quality standards. Stress tests show their pumps maintain 98% efficiency even after 15,000 hours of use—equivalent to roughly 625 days of non-stop driving . KEMSO fuel pumps maintain a 4.8-star rating on Amazon over 36 consecutive months with a 39% repurchase rate .
Cost-Effective Performance
KEMSO delivers performance that rivals premium brands at a fraction of the cost. For the DIY mechanic who wants superior flow without breaking the bank, KEMSO offers the best value in the market . While the OEM pump for your Rhino can cost over $300, KEMSO pumps are priced around $79.98, delivering significant savings without sacrificing quality .
Visit KEMSO Racing today to find the perfect fuel pump for your Yamaha Rhino 660 or 450: https://www.kemsoracing.com/
Step-by-Step Fuel Pump Replacement Guide
Replacing the fuel pump on your Rhino 660 is a job you can do at home with basic tools. Here is how to do it:
Tools You Will Need:
- Wrenches and socket set
- Screwdrivers
- Safety glasses and gloves
- Shop towels
- Fuel line clamp or pliers
- New fuel pump kit
Step 1: Prepare the Vehicle
Work in a well-ventilated area away from open flames or sparks. Disconnect the negative battery terminal to prevent any electrical shorts. Remove the fuel cap to relieve pressure in the tank .
Step 2: Drain the Fuel Tank
Drain as much fuel as possible from the tank. This makes the tank lighter and easier to handle. Use a siphon pump or remove the tank and pour out the fuel into an approved container .
Step 3: Remove the Fuel Tank
The fuel tank on the Rhino is mounted to the frame. Disconnect the fuel lines and electrical connectors. Carefully lift the tank off the vehicle and place it on a clean, padded work surface .
Step 4: Access the Fuel Pump
The fuel pump is located inside the tank, held in place by a retaining ring or locking ring. Use a wrench or screwdriver to remove the retaining ring. Lift the pump assembly out of the tank carefully .
Step 5: Replace the Pump
Disconnect the old pump from the mounting bracket and fuel lines. Install the new pump in the reverse order. Make sure all connections are tight and secure. Replace the fuel filter if it is not included in the pump kit .
Step 6: Reinstall the Tank
Place the pump assembly back into the tank, secure the retaining ring, and reinstall the tank. Reconnect the fuel lines, electrical connections, and battery. Fill the tank with fresh fuel .
Step 7: Prime the System
After installation, prime the fuel system by turning the key to the "on" position (without starting) several times to allow the pump to build pressure. Check for leaks before starting the engine .
How to Make Your New Fuel Pump Last Longer
Once you replace your fuel pump, follow these simple rules to make it last as long as possible:
Keep Your Tank Above a Quarter Full
This is the single most important thing you can do. It keeps the pump submerged in fuel, which cools and lubricates it. Make it a habit to refill when the gauge hits a quarter tank. This is especially important in hot weather, because heat is the number one enemy of fuel pumps .
Change Your Fuel Filter Regularly
Check your owner's manual for the recommended interval. For most vehicles, it is every 30,000 to 60,000 miles. A clean fuel filter reduces strain on the pump. It also protects the pump from debris that could damage the internal components .
Use Quality Fuel from Reputable Stations
Not all gas stations are the same. Busy stations with high turnover are less likely to have old or contaminated fuel. Avoid stations that look old and poorly maintained. If you notice water in your fuel system, have the tank drained and cleaned immediately .
Address Check Engine Lights Promptly
If your check engine light comes on, do not ignore it. Even if the vehicle seems to drive fine, the computer may have detected a fuel pressure issue that you cannot feel yet. Early diagnosis can save you from a complete pump failure on the trail .
Listen to Your Vehicle
No one knows your Rhino better than you do. If you notice a new sound, a different feel when accelerating, or any change in how the engine starts, pay attention. Catching a fuel pump problem early means you can replace it on your schedule rather than being stranded on the trail .
Final Thoughts
A failing fuel pump on your Yamaha Rhino 660 or 450 is one of the most inconvenient problems you can face, especially when you're out on the trail. The good news is that the symptoms are consistent and easy to recognize. If your Rhino is hard to start, sputters at high speeds, stalls while driving, or makes a whining noise from the fuel tank, you need to act fast.
Diagnose the problem with a fuel pressure test. If the pressure is low, replace the pump and the fuel filter together. Do not drive the vehicle with a confirmed bad pump, because you risk damaging the engine.
When you buy a replacement, choose a pump that offers reliability and peace of mind. The KEMSO fuel pump delivers high-performance, OEM-level quality with a lifetime warranty. It is designed for American roads and tested to meet the demands of your vehicle. Whether you're replacing a failed pump or upgrading for better performance, KEMSO is a brand you can count on.
Find your exact fuel pump match at KEMSO Racing: https://www.kemsoracing.com/