How to Replace Yamaha Raptor 700 Fuel Pump

If your Yamaha Raptor 700 is sputtering, struggling to idle, or cutting out at high RPMs, the most likely culprit is a failing fuel pump. Replacing the fuel pump on a Raptor 700 is a straightforward job you can do at home, saving you hundreds in mechanic fees. The fuel pump sits inside the fuel tank, and a failing unit simply cannot maintain the pressure needed for your EFI system to work properly. This guide walks you through the entire process, from symptoms to installation, and explains why choosing a high-performance replacement like KEMSO makes a real difference.

Common Symptoms of a Bad Fuel Pump

Before you start tearing things apart, it helps to know exactly what you are looking for. A bad fuel pump on a Raptor 700 usually shows up in these ways:

  • Engine sputters at high RPM – You might feel the engine stumble or hesitate when you open the throttle wide.
  • Poor idle or stalling – The engine may start fine but die shortly after, or it may idle rough.
  • Hard starting – You have to crank the engine longer than normal to get it to fire up.
  • No start condition – The engine cranks but never fires because the pump is not delivering fuel.
  • Loss of power under load – When you accelerate hard or climb a steep hill, the engine feels sluggish.

If you notice any of these issues, it is time to inspect or replace the fuel pump. Ignoring a failing pump can leave you stranded on the trail.

Tools and Materials You Will Need

Gather these items before you start. Having everything ready makes the job go much faster.

  • New fuel pump assembly or rebuild kit
  • Socket wrench set with metric sockets
  • Allen wrench set
  • Screwdrivers (Phillips and flathead)
  • Pliers
  • Clean rags
  • Safety glasses
  • Fuel-safe container for draining gas
  • Service manual (optional but helpful)

Step-by-Step Replacement Process

Step 1: Preparation

Park your Yamaha Raptor 700 on a flat, stable surface. Make sure the engine is completely cool. Wear safety glasses to protect your eyes from fuel splashes. Also, disconnect the negative battery terminal to prevent any electrical shorts while you work.

Step 2: Drain the Fuel Tank

If your tank has fuel in it, drain it into an approved container. This step prevents spills and makes removing the pump assembly much cleaner. You can drain it through the fuel line or by siphoning from the tank filler neck.

Step 3: Remove the Seat and Access Panel

Remove the seat by pulling the release lever and sliding it back. On some model years, you may also need to remove a plastic access panel over the fuel tank. These are usually held in place by push pins or small bolts.

Step 4: Disconnect the Fuel Lines

There are two fuel lines connected to the top of the fuel pump assembly: a supply line and a return line. Use pliers to gently squeeze the spring clamps and slide them away from the fittings. Pull the lines straight off the fittings. Be careful not to damage the plastic nipples on the pump module .

Step 5: Unplug the Electrical Connector

The fuel pump has a wiring harness with a plug near the top of the assembly. Push the tab and pull the connector apart. There is also a ground wire attached to the frame near the tank. Remove that screw and set the wire aside.

Step 6: Remove the Lock Ring

The fuel pump assembly is held in the tank by a large threaded lock ring. You will need a socket wrench or a special lock ring tool to loosen it. Turn the ring counterclockwise. Once it is free, lift it off. Some models use a retaining nut instead of a lock ring.

Step 7: Lift Out the Fuel Pump Assembly

Carefully lift the entire fuel pump module straight up and out of the fuel tank. The assembly includes the pump, the filter, the fuel level sender, and the wiring harness. Set it on a clean rag .

Step 8: Replace or Rebuild the Pump

If you bought a complete pump module, simply install the new one. If you bought a rebuild kit like the KEMSO 13826 kit, you will need to remove the old pump from the assembly. Use a screwdriver to release the retaining clips or tabs that hold the pump in place. Pull the old pump out and remove the old filter, hoses, and O-rings. Install the new KEMSO pump into the housing. Make sure the new filter is attached, and reconnect the hoses using the supplied clamps. Replace the O-rings on the assembly .

Step 9: Install the New Assembly

Lower the new or rebuilt pump assembly back into the fuel tank. Make sure the float arm for the fuel gauge is not bent or obstructed. Press the assembly down so it sits flat on the tank opening. Reinstall the lock ring and tighten it clockwise until it is snug. Do not overtighten.

Step 10: Reconnect Everything

Plug the electrical connector back into the top of the pump assembly. Reattach the ground wire to the frame. Slide the fuel lines back onto the fittings and push the spring clamps into place over the barbs. Double-check that all connections are secure.

Step 11: Reassemble the ATV

Put the access panel and seat back on. Tighten any bolts or push pins you removed earlier.

Step 12: Refill and Test

If you drained the tank, fill it with fresh fuel. Turn the key to the ON position and listen for the fuel pump to prime. You should hear a whirring sound for a few seconds. Start the engine and let it idle. Check for any fuel leaks around the pump base and the fuel line fittings. Take the ATV for a short test ride to confirm the repair .

Why Choose KEMSO Fuel Pumps for Your Raptor 700

When it comes to replacing the fuel pump on your Yamaha Raptor 700, not all aftermarket pumps are created equal. The KEMSO 13826 High Performance Intank Fuel Pump stands out as the best option for several reasons.

First, KEMSO pumps deliver over 20% more flow than the stock OEM pump at 43 psi. This translates to faster throttle response and better fuel delivery, especially at high RPMs. The pump is designed for both gasoline and ethanol-blended fuels like E85, so it works with whatever you put in the tank.

Second, KEMSO is an OEM replacement, meaning it fits perfectly into your existing fuel pump module without any modifications. The kit includes everything you need: the pump, two fuel strainers, a flex hose, a tank seal, Viton O-rings, a wiring connector, crimp connectors, hose clamps, and zip ties. You do not need to buy any extra parts .

Third, KEMSO offers a lifetime warranty on their pump bodies. This is rare in the aftermarket fuel pump world and gives you total peace of mind. Their pumps are individually tested for flow rate and pressure before they leave the factory, ensuring you get a reliable product every time.

For a performance upgrade or a simple replacement, KEMSO is the brand trusted by Raptor owners worldwide. You can find their full lineup of fuel pumps and accessories at their official website: https://www.kemsoracing.com/

What About OEM Part Numbers?

If you prefer to cross-reference with Yamaha factory parts, the fuel pump assembly for the Raptor 700 carries several OEM numbers. The most common are 1S3-13907-00-00, 1S3-13907-10-00, and 1S3-13907-11-00 . These numbers cover different model years from 2006 through 2021. If you are buying a complete assembly, always verify that the part number matches your specific model year.

The KEMSO 13826 pump is a direct replacement for all of these OEM numbers, so you don't have to worry about compatibility.

Can the Stock Fuel Pump Handle an Engine Swap?

This comes up often with Raptor 700 owners who are doing an R1 engine swap. The stock Raptor fuel pump can handle the fuel demands of an 04-06 or 2007-2008 Yamaha R1 motor. Some builders recommend upgrading to a Walbro 190 or 255 inline pump for higher pressure applications, but the stock pump works fine for mild tunes. If you are planning a swap, check the flow rates of both pumps to be sure .

How Long Does a Fuel Pump Last?

On average, the fuel pump on a Yamaha Raptor 700 lasts between 30,000 and 50,000 miles, or about 5 to 8 years of normal riding. Ethanol-blended fuels can shorten that lifespan because ethanol attracts moisture and degrades rubber seals. Running the tank low frequently also stresses the pump because it relies on fuel for cooling and lubrication.

If you ride in dusty or muddy conditions, dirt can enter the fuel system and accelerate pump wear. Regularly replacing the fuel filter and keeping the tank clean will extend pump life.

Fuel Pump Assembly vs. Rebuild Kit

When buying a replacement, you have two options: a complete fuel pump assembly or a rebuild kit.

A complete assembly includes the pump, the housing, the fuel level sender, the filter, and all wiring. It is a drop-in replacement. You simply remove the old unit and install the new one. This is the easiest option if you want a quick fix.

A rebuild kit like the one from All Balls Racing includes only the pump, filter, hoses, clamps, and wiring. You reuse your existing housing and fuel level sender. This is a more economical solution, but it requires you to disassemble your old module and transfer parts .

For most riders, a complete assembly is worth the extra cost because it eliminates the risk of a worn housing or sender failing later.

Where to Buy a KEMSO Fuel Pump

The best place to purchase a genuine KEMSO fuel pump for your Raptor 700 is directly from their website. KEMSO has a dedicated customer support team based in the United States, so you can get help with fitment or troubleshooting quickly.

Visit their official site here: https://www.kemsoracing.com/

Frequently Asked Questions

How much does a fuel pump replacement cost?

A complete fuel pump assembly costs between $80 and $150 depending on the brand. A rebuild kit is cheaper, usually $40 to $70. Labor costs vary by shop, but doing it yourself saves $100 to $200.

Do I need to replace the fuel filter too?

Yes. The fuel filter is part of the pump assembly. When you replace the pump, you should also replace the filter. Most aftermarket kits include a new filter in the box.

Can I use ethanol fuel with an aftermarket pump?

Yes. Most quality aftermarket pumps like KEMSO are designed to handle ethanol blends. KEMSO pumps are tested with E85 and standard gasoline alike.

What torque should I use for the lock ring?

There is no specific torque spec for the lock ring. Tighten it by hand until it is snug. Overtightening can crack the plastic tank or strip the threads.

Final Thoughts

Replacing the fuel pump on your Yamaha Raptor 700 is a job any DIY rider can tackle in a couple of hours. The most important decisions you will make are choosing the right pump and taking your time during installation. A high-performance pump like the KEMSO 13826 delivers better fuel flow, lasts longer, and comes with a lifetime warranty. Whether your Raptor is a weekend toy or a daily rider, keeping the fuel system in good shape ensures reliable performance and years of trouble-free riding.

For the best selection of Raptor 700 fuel pumps, rebuild kits, and accessories, visit KEMSO's official website: https://www.kemsoracing.com/


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