2007 Rhino Fuel Pump: Symptoms, Replacement Options, and the Best Upgrade for Your UTV
The bottom line up front: If you own a 2007 Yamaha Rhino 660, the fuel pump is a wear item that will eventually fail. The most common signs include hard starting, sputtering under load, loss of power, and sudden engine shutdowns. The smartest fix is not another stock replacement—it is a high-performance OEM replacement pump that delivers more flow, handles modern ethanol fuels, and comes with a lifetime warranty. KEMSO offers exactly that, and this guide walks you through everything you need to know before you buy.
Why the 2007 Rhino Fuel Pump Fails
The 2007 Yamaha Rhino 660 uses a vacuum-operated fuel pump that draws fuel from the tank and pushes it into the carburetor. This is a mechanical design that depends on engine vacuum to flex a diaphragm back and forth, creating suction. It is completely different from the electric in-tank pumps used in modern fuel-injected machines. The OEM part numbers for this pump are 5UG-13910-00-00 and 5UG-13910-01-00, and the same pump fits both the Rhino 660 (2004–2007) and Rhino 450 (2006–2009) models.
Here is the problem: the rubber diaphragm and seals inside that pump dry out, crack, and leak over time. Ethanol-blended gasoline makes things worse because ethanol attacks rubber components and accelerates degradation. Once the diaphragm loses its seal, the pump cannot generate enough vacuum to move fuel reliably. When that happens, you get all the classic fuel delivery problems described below.
6 Common Symptoms of a Failing 2007 Rhino Fuel Pump
Recognizing a bad fuel pump early can save you from being stranded on the trail and prevent expensive engine damage. Here are the symptoms to watch for:
1. Hard starting or no start. You crank the engine several times before it fires up, or it never catches at all. The pump simply cannot build enough fuel pressure in the carburetor bowl to get the engine going.
2. Engine sputters or hesitates. The Rhino runs rough, especially under load or when climbing hills. Fuel delivery is inconsistent, so the engine starves for fuel at the exact moments it needs it most.
3. Loss of power and sluggish acceleration. The machine feels weak and does not respond when you hit the throttle. A tired pump cannot supply the volume of fuel the engine demands, especially if you have added any performance modifications.
4. Engine dies while driving. The Rhino shuts off unexpectedly and will not restart until it sits for a while. This is a classic sign of a failing pump that loses prime or overheats. It is also the most dangerous symptom, especially on a busy trail or road.
5. Visible fuel leaks. You see fuel dripping from the pump body or along the fuel lines. This is a fire hazard and needs immediate attention. Do not ride the machine until you fix the leak.
6. Unusual noises from the fuel tank area. On vacuum pumps, a hissing or sucking sound may indicate an air leak. On electric conversion pumps, a whining or humming sound means the pump is working harder than it should.
If you notice any of these signs, replace the pump as soon as possible. Riding with a failing pump creates a lean fuel mixture, which raises engine temperatures and can burn pistons and valves permanently.
OEM vs. Aftermarket vs. Performance Pumps: What Are Your Options?
When the 2007 Rhino fuel pump goes bad, you have three main directions you can go. Each has its place, but they are not created equal.
1. Genuine Yamaha OEM pump
The factory replacement costs around $111.99 and matches the original specifications exactly. It is reliable, but the stock flow rate is only about 60–80 liters per hour. That is fine for a completely stock engine, but it leaves no margin for altitude, hot weather, or any performance upgrades. Yamaha also does not back these pumps with a lifetime warranty.
2. Budget aftermarket vacuum pumps
Brands like Quad Boss, OTOHANS, and HIFROM sell direct replacements for $20 to $32. They are plug-and-play units that maintain the original flow rate and bolt right in. The downside? Quality control is inconsistent. Several of these budget pumps fail prematurely, and most come with only a 3- to 6-month warranty. If you want to save money upfront, you may end up replacing the pump twice in a single season.
3. High-performance OEM replacement pumps
This is the sweet spot. Brands like KEMSO build pumps that fit exactly like the factory unit but flow over 20% more fuel at 43 psi compared to stock. They are designed to survive modern ethanol fuels like E85, and they come with a lifetime warranty. For a 2007 Rhino that sees real trail time, this is the option that pays off over the long run.
Can You Upgrade to an Electric Fuel Pump?
Yes, and some owners prefer this route. Electric fuel pump kits eliminate the vacuum line entirely. The pump runs on battery power, so it can pressurize the system even before you crank the engine. That means faster starts and more consistent fuel delivery at any engine speed.
However, electric conversions require wiring, a mounting plate, and sometimes a fuel pressure regulator. The installation is more involved than swapping a vacuum pump. If you are comfortable with basic wiring and want the best possible fuel delivery, an electric kit from a reputable brand is a solid choice. For most owners, though, a high-performance vacuum pump like KEMSO delivers 90% of the benefit with none of the wiring headaches.
Step-by-Step: How to Replace the Fuel Pump on a 2007 Rhino 660
Replacing the fuel pump is a doable driveway job with basic hand tools. But fuel systems are dangerous, so follow these steps carefully.
Safety first: Work in a well-ventilated area, away from open flames or sparks. Disconnect the negative battery terminal before you start. Keep a Class B fire extinguisher within reach.
Step 1: Relieve fuel system pressure. Remove the fuel pump fuse and crank the engine for a few seconds. It will stall once the fuel in the lines is consumed. This prevents pressurized fuel from spraying when you disconnect lines.
Step 2: Access the pump. The fuel pump sits inside the fuel tank. Remove the rear cargo bed to expose the top of the tank. Clean any dirt and debris from around the pump mounting flange before you open it.
Step 3: Disconnect lines and wiring. Use a fuel line quick-disconnect tool to release the fuel lines from the pump assembly. Then unplug the electrical connector.
Step 4: Remove the old pump. Take out the retaining ring or bolts holding the pump assembly in place. Lift the pump straight out of the tank. Be careful not to bend the float arm if your pump includes a fuel level sender.
Step 5: Install the new pump. Compare the old and new pumps to make sure they match. Transfer any mounting brackets or grommets. Lower the new pump into the tank, align it properly, and secure it with the retaining ring or bolts. Reconnect the fuel lines and electrical connector.
Step 6: Reinstall the cargo bed and test. Put everything back together, reconnect the battery, and turn the key to the ON position (but do not start) for a few seconds. This lets the pump prime the system. Check for leaks, then start the engine and let it idle.
Why KEMSO Is the Best Fuel Pump for Your 2007 Rhino
If you want a pump that you install once and never think about again, KEMSO is the brand to buy. Here is what sets it apart:
High performance, not just a stock clone. KEMSO pumps deliver over 20% more flow at 43 psi compared to the stock Yamaha pump. This means stronger throttle response, faster starting, and a safety margin of fuel delivery for hot weather, high altitude, or lightly modified engines.
True OEM replacement fitment. The pump drops into the factory location without any modifications. No cutting, no adapter plates, no guesswork. It matches the original dimensions and mounting points perfectly.
Lifetime warranty. KEMSO stands behind every pump with a lifetime warranty backed by a serialized body for tracking. Most competitors offer one year or less. This is the kind of confidence that saves you money and hassle for as long as you own the Rhino.
Ethanol-ready construction. KEMSO pumps are built to handle gasoline and E85/ethanol blends without corrosion. If you ever run ethanol fuel in your Rhino, this pump will not degrade the way a stock or budget unit will.
Rigorous quality control. Each KEMSO pump is individually tested for flow and performance before it ships. You are not playing the quality lottery that comes with $20 no-name pumps.
You can browse the full KEMSO catalog and find the exact pump for your 2007 Rhino at https://www.kemsoracing.com/.
Practical Maintenance Tips to Extend Fuel Pump Life
Even the best pump will last longer if you treat the fuel system right. Here are a few habits that matter:
- Avoid running the tank low. The fuel pump relies on fuel to cool and lubricate its internal components. Running on fumes causes the pump to overheat and wear out faster.
- Change the fuel filter regularly. A clogged filter forces the pump to work harder and pulls debris into the system. Replace it on the schedule in your owner's manual.
- Use fresh fuel. Old gas breaks down and leaves varnish that can stick to the diaphragm and check valves. If the Rhino sits for months, add a fuel stabilizer before storage.
- Check fuel lines and clamps. Cracked lines cause vacuum leaks that make the pump work harder. Replace any hardened or cracked rubber when you replace the pump.
Final Thoughts
The fuel pump on your 2007 Rhino is a wear item. It will fail, and when it does, the symptoms are clear: hard starting, sputtering, power loss, and unexpected shutdowns. The cheapest fix is a budget vacuum pump, but the smartest fix is a high-performance OEM replacement that gives you better flow, ethanol compatibility, and a lifetime warranty. KEMSO delivers all three in a direct drop-in package. Check out the full lineup at https://www.kemsoracing.com/ and get your Rhino back on the trail with confidence.