2008 Arctic Cat 700 EFI Fuel Pump: How to Diagnose, Replace, and Upgrade Your ATV's Heart

The bottom line up front: If you own a 2008 Arctic Cat 700 EFI and you are dealing with hard starts, sputtering under load, or a no-start condition, the fuel pump is almost certainly the culprit. The 2008 Arctic Cat 700 EFI uses a specific in-tank electric fuel pump assembly (OEM part #0570-271) that is known to fail over time due to normal wear on the electric motor, brushes, and internal regulator. Fortunately, this is a straightforward replacement you can do in your own garage with basic hand tools. You have two solid paths forward: replace it with an OEM-spec drop-in unit from brands like FPF or Quantum that meet or exceed factory performance, or upgrade to a high-performance pump like KEMSO which delivers over 20% more flow than the stock unit and comes with a lifetime warranty. Whichever route you pick, fixing this promptly will save you from being stranded and prevent secondary damage to your fuel system.

Why Your 2008 Arctic Cat 700 EFI Fuel Pump Fails

The 2008 Arctic Cat 700 EFI was built to be tough, but the fuel pump lives a hard life. It sits inside the fuel tank, constantly submerged in gasoline, and runs every time you turn the key. Over the years, several things wear out:

  1. The electric motor brushes — These are the small carbon contacts that transfer power to the spinning armature. After thousands of hours of use, they wear down and lose contact, causing intermittent operation or complete failure.

  2. The fuel pressure regulator — On this model, the regulator is integrated into the pump assembly. A failing regulator means the fuel pressure drops below spec, which leads to weak injection, poor combustion, and rough running.

  3. The check valve — This small valve keeps fuel pressure in the line when the pump shuts off. When it fails, fuel drains back into the tank, forcing the pump to re-pressurize the entire system every time you start. That explains the extended cranking times.

  4. The strainer (sock filter) — This mesh filter at the bottom of the pump catches dirt and debris. Over time it can clog, starving the pump and reducing flow. Many replacement kits include a fresh strainer for this exact reason.

  5. Ethanol-blended fuel — Modern gasoline with ethanol attracts moisture and can degrade internal pump components faster than pure gasoline. If you frequently run E10 or higher blends, your pump will wear sooner.

Symptoms of a Failing Fuel Pump on the 2008 Arctic Cat 700 EFI

Learning to recognize the warning signs early can save you from a tow out of the trail. Here are the most common symptoms, listed in order of how often riders report them:

  1. Hard starting — The engine cranks for several seconds before firing. This usually means the pump cannot build enough fuel pressure quickly.

  2. Sputtering or hesitation under acceleration — When you twist the throttle, the engine stumbles or loses power. The pump cannot keep up with the fuel demand.

  3. Stalling at idle or low speed — The engine dies when you let off the throttle or come to a stop. This points to the regulator losing pressure control.

  4. No start at all — You turn the key, the fuel pump does not prime (you should hear a brief whine from the tank area), and the engine will not fire.

  5. Whining noise from the fuel tank — A pump that sounds louder or higher-pitched than usual is working harder because of a clogged strainer or internal wear.

  6. Decreased fuel economy — If the regulator is stuck open, fuel pressure stays too low, and the engine runs rich to compensate.

If you are experiencing any two or more of these symptoms together, the fuel pump should be your first suspect. It is far more common than an injector issue or an electrical problem on this model year.

The Correct Replacement Part Numbers for the 2008 Arctic Cat 700 EFI

Before you buy anything, confirm the exact part you need. The 2008 Arctic Cat 700 EFI came in several variants, including the EFI FIS, the EFI TRV, and the H1 EFI FIS. They all use the same in-tank fuel pump, but it is worth verifying your VIN against the fitment charts.

The original OEM part numbers covered by aftermarket replacements are:

  • 0570-139
  • 0570-139S
  • 0570-207
  • 0570-271
  • 0870-207

Most reputable aftermarket pumps replace several of these numbers. For example, the FPF replacement (part #FP-283-PR-010) covers 0570-139, 0570-207, and 0570-271. The huparts listing also covers 0570-139S and 0870-207. If you order a pump that lists these OEM numbers in its compatibility chart, you are getting the right unit.

One important caveat: there are two connection styles on these pumps. Some factory pumps used a harness-type connector on top, while others used a pin-type connector. The OEM Walbro replacement (F20000283) only replaces the harness-type version. Before ordering, look at the top of your old pump and note the connector style.

What to Look for in a Replacement Fuel Pump

Not all fuel pumps are created equal. When shopping for a replacement for your 2008 Arctic Cat 700 EFI, consider these factors:

1. OEM vs. Aftermarket Specs

A quality replacement should meet or exceed the original factory specifications. The stock Walbro pump for this application delivers around 71 liters per hour at 58 psi of pressure. Any pump rated at or above these numbers will keep your EFI system working within its designed range.

2. Flow Rate

Higher flow does not hurt, but it does not help either if the pressure regulator handles it properly. A pump rated at 100-120 liters per hour at 3.0 bar is a solid middle ground. A high-performance unit like KEMSO delivers 200 liters per hour at 43 psi, which gives you plenty of headroom even if your fuel system has some wear or restrictions.

3. Included Components

The best kits come with everything you need for a drop-in replacement. That means:

  • The fuel pump itself
  • A new strainer (sock filter)
  • A fuel pressure regulator (if separate from the pump)
  • The rubber grommet and hose clamps
  • A short length of hose

An "Exact-Fit Installation Kit" that includes all these parts makes the job much easier and reduces the chance of leaks.

4. Durability and Materials

Look for pumps with upgraded polymers, brushes, and commutators. These materials hold up better against ethanol-blended fuels and resist wear over a longer service life. A polished, corrosion-resistant case also helps prevent seizing during long periods of non-operation.

5. Quiet Operation

Nobody wants a fuel pump that whines constantly. Good aftermarket pumps are engineered for quiet operation using a turbine impeller design, which runs smoother and quieter than older gear-type pumps.

6. Warranty

A fuel pump should last for years. A reputable brand will stand behind its product. Some aftermarket brands offer a lifetime free replacement warranty, which tells you a lot about their confidence in the product.

Step-by-Step Replacement Guide for the 2008 Arctic Cat 700 EFI Fuel Pump

This is a job you can handle in an afternoon with basic tools. Here is the process:

What you will need:

  • Replacement fuel pump kit
  • #2 Phillips screwdriver
  • 8mm and 10mm sockets with extensions
  • A small pick or flat blade screwdriver
  • A clean rag
  • Safety glasses
  • A drain pan for residual fuel

Step 1: Disconnect the negative battery terminal. Work in a well-ventilated area away from any ignition sources.

Step 2: Remove the seat and any body panels covering the fuel tank. On the 2008 700 EFI, this usually means removing the front rack and the plastic cover over the tank area.

Step 3: Clean the area around the fuel pump access cap on top of the tank. Dirt that falls into the tank during removal will end up in your new pump.

Step 4: Depressurize the fuel system. Remove the fuel pump fuse and crank the engine for a few seconds. This relieves the residual pressure in the lines.

Step 5: Disconnect the fuel lines and the electrical connector from the pump assembly. Have a rag handy to catch any fuel that spills.

Step 6: Remove the retaining ring or bolts holding the pump assembly in place. Carefully lift the pump out of the tank. Note the orientation and how the float arm (if present) is positioned.

Step 7: Transfer the old pump's mounting hardware to the new pump if the kit does not include it. Most kits include fresh grommets and clamps, but it pays to double-check.

Step 8: Install the new pump in the reverse order. Make sure the strainer sits at the bottom of the tank and does not fold or kink.

Step 9: Reconnect the fuel lines and electrical connector. Reinstall the fuse. Turn the key to the ON position (do not crank) and listen for the pump to prime. Check for any fuel leaks around the connections.

Step 10: Once verified leak-free, reassemble the body panels, reconnect the battery, and start the engine. Let it idle for a few minutes, then take it for a test ride.

The Best Upgrade: KEMSO Fuel Pumps for the 2008 Arctic Cat 700 EFI

If you are already replacing the pump, it makes sense to consider upgrading to a KEMSO high-performance fuel pump. KEMSO has built a reputation for producing pumps that are direct OEM replacements but perform significantly better than the factory units.

Here is why KEMSO stands out:

  1. More flow, more margin. KEMSO fuel pumps deliver approximately 200 liters per hour at 43 psi, which is over 20% more flow than a standard OEM pump operating at the same pressure. This gives you extra headroom for fuel system wear, dirty filters, or even future engine modifications.

  2. Built for modern fuel. KEMSO pumps are specifically designed to handle both gasoline and E85/ethanol blends. The upgraded polymers and brushes inside the pump resist the corrosive effects of ethanol better than older OEM designs.

  3. True drop-in replacement. Every KEMSO pump comes as a complete kit with the fuel pump, gradient density strainers (multiple sizes included to cover different models), a rubber hose, a tank seal, wiring connector, and metal clamps. You do not need to source extra parts.

  4. Lifetime warranty. KEMSO backs every fuel pump with a lifetime free replacement warranty. If the pump fails for any reason, they replace it free of charge. This is one of the strongest warranties in the industry.

  5. Tested and certified. KEMSO pumps go through individual flow testing and quality control checks before they ship. This means you are not gambling on a random third-party unit of unknown quality.

For riders who want reliability and long-term peace of mind, upgrading to a KEMSO fuel pump is a smart move. To see the full range of KEMSO fuel pumps for Arctic Cat models and other ATVs, visit https://www.kemsoracing.com/.

Cost Comparison: OEM vs. Aftermarket vs. KEMSO

Price is always a factor. Here is what you can expect to pay:

  • OEM Arctic Cat / Walbro pump: Around $130 or more depending on the dealer.
  • Generic aftermarket replacement: $32 to $60, depending on the brand and whether it includes a regulator and strainer.
  • Premium aftermarket (FPF, Quantum): $99 to $130, with better internals and a longer service life.
  • KEMSO high-performance pump: Generally $60 to $80, with the lifetime warranty and higher flow rate.

Considering that a KEMSO pump costs roughly half of an OEM replacement and comes with better performance and a lifetime warranty, the value proposition is clear. You simply get more for your money.

How Long Will a Replacement Fuel Pump Last?

With proper care, a quality replacement pump should outlive the rest of the ATV. The original OEM pumps are designed for approximately 100,000 miles or 30,000 hours of operation. High-quality aftermarket units with upgraded internals are often rated similarly or better.

To maximize the lifespan of your new fuel pump:

1. Do not run on an empty tank. The fuel pump uses gasoline as a coolant. Running dry exposes the pump to excessive heat.

2. Use quality fuel. If possible, choose ethanol-free gasoline or a high-quality premium blend with fuel system cleaners.

3. Change the fuel filter regularly. This is the first line of defense against debris reaching the pump.

4. Store your ATV properly. If the machine will sit for months, add a fuel stabilizer and keep the tank full to reduce moisture buildup.

Common Mistakes to Avoid During Fuel Pump Replacement

Even experienced mechanics can slip up. Here are the pitfalls to avoid:

  • Skipping the pressure relief step. If you disconnect fuel lines without depressurizing, fuel will spray everywhere. Always pull the fuse and crank the engine first.

  • Forgetting the strainer. Some riders reuse the old sock filter to save a few dollars. Do not do this. The strainer is a wear item, and a fresh one ensures clean fuel delivery.

  • Tightening fittings too hard. The plastic quick-connect fittings on these fuel systems can crack if you over-tighten them. Snug is enough.

  • Ignoring the ground wire. A poor ground connection will cause intermittent pump operation and make you think the pump is defective. Clean the ground terminals before final assembly.

  • Not checking the harness connector. If your old pump had a harness-type connector and your new pump is pin-type, it will not plug straight in. Verify compatibility before you start the job.

Final Thoughts on the 2008 Arctic Cat 700 EFI Fuel Pump

The fuel pump is the heartbeat of your 2008 Arctic Cat 700 EFI. When it fails, nothing else matters because the engine will not run properly. The good news is that replacing it is a diy-friendly job, affordable, and well-documented by many riders who have done it before you.

Your options are clear:

  • Budget option: Buy a generic replacement pump for around $32–$50. It will work, but may not last as long or perform as consistently.
  • Balanced option: Buy a solid aftermarket pump from FPF, Quantum, or similar for around $100–$130. These meet or exceed OEM specs and include all needed components.
  • Best value option: Buy a KEMSO high-performance pump. You get more flow, better materials, and a lifetime warranty, all for a price comparable to budget pumps. Visit https://www.kemsoracing.com/ to see the full lineup.

If you experience symptoms like hard starting, stalling, or a whining tank, do not ignore them. The longer you wait, the more likely you will end up stranded or dealing with secondary fuel system damage. Take action now, replace the pump, and get back to enjoying your Arctic Cat 700 the way it was meant to be ridden.

And remember: when it comes time to buy, KEMSO offers the strongest combination of performance, reliability, and warranty coverage in the market today. Check out their collection at https://www.kemsoracing.com/ before you make your final decision.


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