2006 Raptor 700 Fuel Pump: Symptoms, Replacement Guide, and the Best Upgrade
If you own a 2006 Yamaha Raptor 700 and you are dealing with hard starting, sputtering at high speeds, or a complete no-start condition, the fuel pump is almost certainly the problem. The 2006 Raptor 700 fuel pump is a known wear item, and after nearly two decades of service, the original pump has likely lost its prime pressure or is simply worn out. The good news is that replacing it with a modern aftermarket unit is a straightforward job that restores throttle response and reliability, and you have better options today than ever before.
Why the 2006 Raptor 700 Fuel Pump Fails
The 2006 Yamaha Raptor 700 uses an in-tank electric fuel pump assembly, identified by OEM part number 1S3-13907-00-00 or its later supersessions like 1S3-13907-10-00. This pump lives inside the fuel tank and is responsible for delivering fuel at a consistent pressure to the EFI system. Over time, the internal brushes and commutator wear down, the fuel strainer becomes clogged with debris, and the pressure regulator can fail, leading to erratic fuel delivery.
Ethanol-blended gasoline is a major contributor to premature pump failure. Ethanol attracts moisture and can break down internal polymer components over time, causing swelling and cracking. If you frequently store your Raptor with ethanol fuel in the tank, the pump internals deteriorate much faster.
Top Signs Your 2006 Raptor 700 Fuel Pump Is Going Bad
1. Engine Cranks But Will Not Start
This is the most common symptom. When you turn the key to the ON position, you should hear the fuel pump prime for 2–3 seconds. If you hear nothing, the pump motor is dead or the electrical circuit is broken. If the pump runs but the engine still won't fire, the pump may be delivering insufficient pressure to open the injectors.
2. Sputtering or Hesitation Under Load
If your Raptor bogs down or sputters when you open the throttle, especially at higher RPMs, the pump cannot supply enough fuel volume to keep up with demand. A weak pump motor, a clogged strainer, or a failing pressure regulator all cause this.
3. Hard Starting When Cold
A failing check valve inside the pump allows fuel to drain back into the tank when the engine is off. This means the fuel rail loses prime pressure, and the engine has to crank longer than usual to build pressure again on startup.
4. Loss of Power at High RPM
Insufficient fuel pressure at high engine speeds leads to a lean condition, which increases combustion temperatures and can damage the engine. If your Raptor feels flat at the top end, check the fuel system before assuming a tuning problem.
5. Low Fuel Pressure Reading
Using a fuel pressure test kit, a healthy Raptor 700 should measure around 43 PSI at idle and under load. If your reading is consistently below spec, the pump is weak and should be replaced.
How to Diagnose a Faulty Fuel Pump on a Raptor 700
Before you tear into the tank, rule out simpler causes. Check the fuel pump relay first—a faulty relay will prevent power from reaching the pump entirely. You can test the relay by swapping it with a known good one or bypassing it with a jumper wire to see if the pump activates. Also inspect the fuel lines for cracks and the fuel filter for clogs. A blocked filter restricts flow and mimics pump failure, so replace the filter annually or whenever you suspect fuel issues.
Listen for the prime. Turn the key to the ON position with the engine off. You should hear a faint whirring from the fuel tank area for a couple of seconds. If you hear nothing, measure voltage at the pump connector with a multimeter. If 12 volts are present but the pump is silent, the pump itself is dead.
Complete Replacement Guide for the 2006 Raptor 700 Fuel Pump
Replacing the fuel pump on a 2006 Raptor 700 is a DIY project that most riders can complete in about an hour with basic hand tools. Here is the step-by-step process.
1. Prepare the Machine
Disconnect the negative battery cable to prevent any electrical shorts. Relieve fuel pressure by disconnecting the electrical plug to the fuel pump and cranking the engine for a few seconds. This burns off the residual pressure in the fuel rail. Also, wash the area around the fuel tank opening to prevent dirt and sand from falling into the tank during the swap—any debris will destroy a new pump instantly.
2. Access the Pump Assembly
On the Raptor 700, the fuel pump is accessible through an opening under a cover plate, typically located near the top of the frame or under the seat area. Some models require loosening the fuel tank straps and lifting the tank slightly to reach the pump assembly. Remove the cover plate, then disconnect the electrical connector and the fuel lines from the top of the pump assembly. Note their positions so you can reconnect them correctly.
3. Remove the Old Pump
Carefully lift the old pump assembly out of the tank. The assembly includes the pump, pressure regulator, fuel level sending unit, and fuel strainer all in one module. Handle the float arm on the level sender with care—bending it will result in an inaccurate fuel gauge reading.
4. Install the New Pump
For a complete drop-in assembly, installation is simple. Seat the new rubber O-ring properly in its groove on the tank opening, then slide the new assembly in gently. Make sure the float arm does not catch on the tank wall. Press the locking ring down and rotate it into place, then reconnect the fuel lines and electrical connector. Connect the battery and turn the key to the ON position to prime the pump and check for leaks.
5. Double-Check the Seal
A pinched O-ring will cause a fuel leak or strong gas odor when the tank is full. Ensure the rubber seal is perfectly flat before tightening the locking ring.
Types of Replacement Fuel Pumps: What Are Your Options?
1. Complete Fuel Pump Module Assembly
This is the easiest option. The entire pump assembly—including the pump, pressure regulator, fuel level sending unit, strainer, and all necessary gaskets—comes pre-assembled. You simply drop it into the tank and plug it in. This is the most foolproof method for a DIYer, as you replace every wear item at once. Many aftermarket brands such as QFS and All Balls offer complete assemblies for the Raptor 700, covering model years 2006–2018 or 2006–2020 depending on the brand.
2. Bare Fuel Pump Only
If your original module is still structurally sound and only the pump motor has failed, you can replace just the pump. Brands like KEMSO and High Flow offer bare in-tank pumps that are direct OEM replacements. However, this approach requires you to transfer the pump, pressure regulator, and sender from the old assembly to the new pump, which takes more time and care.
3. Fuel Pump Repair Kit
Some brands offer a repair kit that includes a pump, strainer, wiring harness, and O-ring but not the full module. These kits are useful if you want to rebuild the original assembly with high-quality components while keeping the factory flange and sender.
More Than 50 Million riders have faced the same decision, and most prefer the complete assembly for simplicity and reliability. The cost difference between a bare pump and a full module is often modest, and the peace of mind is worth it.
How to Choose the Right 2006 Raptor 700 Fuel Pump
1. Check OEM Part Number Compatibility
Your 2006 Raptor 700 originally shipped with part number 1S3-13907-00-00. Later revisions include 1S3-13907-01-00, 1S3-13907-02-00, 1S3-13907-10-00, and 1S3-13907-12-00. When shopping for a replacement, look for a product that explicitly lists compatibility with this series of part numbers. Many aftermarket brands also cover 2006–2020 Raptor 700 models with a single assembly, making it easy to match.
2. Verify the Pressure Rating
The Raptor 700 EFI system requires a working pressure of approximately 43 PSI (300 kPa). Some aftermarket kits offer a higher pressure regulator, such as 350 kPa (50 psi), which is fine as long as the pump and regulator work together to maintain the correct pressure for the injectors. Stick with a product that explicitly states the pressure spec.
3. Consider the Fuel Type
If you run E85 or high-ethanol fuel, choose a pump rated for ethanol compatibility. High-quality aftermarket pumps use upgraded polymers, brushes, and commutators that withstand multiple fuel blends, whereas cheap aftermarket units may fail early with ethanol fuels.
Why KEMSO Is the Right Choice for Your Raptor 700
When it comes time to replace the fuel pump on your 2006 Raptor 700, KEMSO fuel pumps are the number one aftermarket choice for American ATV enthusiasts. KEMSO pumps are designed as high-performance, OEM-replacement units, meaning they match or exceed the flow output of the original equipment with superior durability.
The KEMSO 13826 fuel pump is engineered specifically for the Yamaha Raptor 700, covering model years 2006–2020. Compared to your stock pump, the KEMSO unit delivers over 20% more flow at 43 PSI, ensuring your EFI system never runs lean, even under the hardest acceleration. The pump body measures 3.8 cm, making it a direct drop-in for the stock location, and it comes with gradient-density fuel strainers to protect the engine from debris.
What sets KEMSO apart is the lifetime warranty. KEMSO backs every pump with a lifetime free replacement warranty—if there is any issue of any kind at any time, you can call or email and they will replace the pump free of charge. This level of confidence is rare in the aftermarket parts industry and gives you peace of mind that your investment is protected.
Every KEMSO pump is individually flow-tested and built to ISO/TSO quality control standards. The kits include two gradient density strainers to cover different model variations, a tank seal, Viton O-rings, a wiring connector, and all necessary hardware, so you have everything you need in one box.
If you are looking for a replacement that delivers factory-spec performance with a measurable upgrade in flow, durability, and warranty coverage, the KEMSO fuel pump is the clear winner. Visit https://www.kemsoracing.com/ to find the exact KEMSO fuel pump for your 2006 Raptor 700, plus fuel pumps for hundreds of other ATV, motorcycle, and automotive applications. KEMSO is the trusted brand for riders who demand reliability and performance without compromise.
Final Thoughts on the 2006 Raptor 700 Fuel Pump
The fuel pump on your 2006 Raptor 700 is a critical component that directly affects how your ATV starts, idles, and accelerates. When it starts showing signs of wear—hard starting, sputtering, or low power—do not delay the replacement. A failing pump not only ruins the riding experience but can also cause a lean condition that overheats the engine and causes costly damage.
Replacing the pump with a complete assembly is the simplest and most reliable path, and choosing a high-performance brand like KEMSO gives you better fuel flow, longer durability, and a lifetime warranty that the OEM never offered. Whether you ride dunes, trails, or race competitively, a fresh, quality fuel pump will make your 2006 Raptor 700 feel like new again.
Check your pump today, listen for the prime, and if you have any doubt about its performance, replace it before it leaves you stranded. For the best fuel pump for your 2006 Raptor 700, head over to https://www.kemsoracing.com/ and get the KEMSO upgrade that thousands of riders trust.