2007 Arctic Cat 700 EFI Fuel Pump Assembly: Complete Guide to Symptoms, Testing, and Replacement
If you own a 2007 Arctic Cat 700 EFI and you are experiencing hard starting, loss of power, stalling, or a no-start condition, the fuel pump assembly is almost certainly the culprit. The 2007 Arctic Cat 700 EFI relies entirely on a submerged electric fuel pump inside the gas tank to pressurize fuel for the throttle body injector, and when that pump weakens or fails, the engine simply cannot run properly. This guide walks you through everything you need to know about the 2007 Arctic Cat 700 EFI fuel pump assembly—how it works, what goes wrong, how to test it, what replacement parts fit, and how to install a new unit without paying dealer prices.
The fuel pump assembly on this machine is not just a bare pump. It is a complete in-tank module that includes the electric pump motor, a fuel pressure regulator, a strainer sock, and the float arm for the fuel level sender, all housed in a single unit that mounts through the top of the gas tank. When the ignition is turned on, the pump primes the system for about ten seconds, building pressure to roughly 3.0 kg-cm² (about 43 PSI), before the regulator takes over to hold steady pressure for the injector. Because the pump sits inside the fuel tank, it relies on the gasoline around it for cooling, which is why running the tank low is one of the leading causes of premature pump failure.
Understanding the Fuel Pump Assembly Layout
Before you start turning wrenches, it helps to understand what you are working with. The 2007 Arctic Cat 700 EFI uses a 695cc single-cylinder engine with electronic fuel injection, and the entire fuel delivery system is controlled by the ECU. The fuel pump assembly is located inside the gas tank, which sits under the rear rack. The assembly itself has several key components:
Electric Pump Motor — This is the heart of the system. It draws fuel through the strainer and pushes it under pressure to the throttle body. The pump is a positive displacement design, typically a turbine or gerotor type, chosen for steady delivery across varying engine loads and fuel levels.
Fuel Pressure Regulator — This small valve maintains a constant pressure at the injector regardless of engine load. If the regulator fails, you end up with either too much fuel (running rich) or too little (running lean), and both conditions can damage the engine over time.
Fuel Strainer (Sock) — This coarse filter sits at the pump inlet and is the first line of defense against dirt, rust, and debris in the tank. You should replace this sock whenever you swap the pump, and never reuse an old one that has been exposed to contaminated fuel.
Float Arm and Sender — The assembly also carries the float arm that drives the fuel gauge. If you damage this arm during removal, you will need to replace the entire assembly, so handle it with care.
Wiring and Connectors — The pump gets power through a dedicated connector that reaches under the rear rack. Corroded or loose connectors are a common cause of intermittent pump operation, so always check this area before condemning the pump itself.
Common Symptoms of a Failing Fuel Pump
A failing fuel pump rarely gives out all at once. More often, it sends you warning signs over days or weeks. Here are the most common symptoms to watch for on a 2007 Arctic Cat 700 EFI:
1. Hard Starting, Especially When Cold — If the engine cranks but takes multiple attempts to fire, the pump may not be building enough pressure for the injector to deliver a proper fuel charge. You might also notice that cycling the key several times (letting the pump prime each time) eventually gets the engine started.
2. Loss of Power Under Load — The machine may run fine at idle or light throttle but bog down, hesitate, or feel flat during acceleration or when climbing hills. This happens because the pump can deliver enough fuel at low demand but cannot keep up when the engine needs maximum flow.
3. Stalling at Idle or Low Speed — If the engine dies unexpectedly, particularly when you come to a stop, the pump may be intermittently losing prime or failing to maintain pressure. This is one of the more dangerous symptoms because it can leave you stranded mid-trail.
4. Sputtering or Rough Running — Inconsistent fuel delivery causes the engine to surge, misfire, or run unevenly. If you notice the machine feeling "jerky" on smooth terrain, fuel delivery is the first place to look.
5. Whining or Humming Noise from the Fuel Tank — A healthy pump makes a brief, quiet whir when you turn the key on. If you hear a loud, high-pitched whine or groan that continues longer than a few seconds, the pump is struggling internally and likely nearing the end of its life.
6. No Priming Sound at All — Turn the ignition to the ON position and listen near the rear fender. You should hear the pump run for about ten seconds. If there is absolute silence, the pump either has no power or is dead internally.
How to Test the Fuel Pump Before Replacing It
Do not buy a new pump until you have confirmed the problem. A clogged fuel filter, a bad relay, a blown fuse, or corroded wiring can all produce symptoms that look exactly like a dead pump. Follow these steps in order:
Step 1: Listen for the Prime — Turn the ignition switch to the ON position without cranking the engine. You should hear a momentary whirring sound as the pump builds pressure. If you hear it, the electrical side is at least working, and you can move on to I pressure testing.
Step 2: Check the Fuel Pressure — Disconnect the gas line hose from the throttle body and install a suitable fuel pressure gauge. Place an absorbent towel under the connection, because gasoline will be under pressure and will spray when you break the line. Turn the ignition to the ON position. The pressure should build until the pump shuts off, and the reading should be about 3.0 kg-cm² (43 PSI). If the pressure comes up slowly, peaks below spec, or drops quickly after the pump stops, you have a pump, regulator, or filter problem.
Step 3: Check for Power at the Pump Connector — If the pump does not run at all, reach under the rear rack and disconnect the fuel pump/tank sensor connector. Using a multimeter, connect the red lead to the red wire and the black lead to the black wire, then turn the ignition to the ON position. You should read battery voltage. If you have voltage and the pump does not run, the pump is dead and must be replaced. If you have no voltage, check the ECU and the vehicle tilt sensor before buying anything.
Step 4: Inspect the Relay and Fuse — A bad relay or blown fuse can prevent the pump from getting power. Locate the fuel pump relay and fuse (refer to your service manual for exact locations) and test both with a multimeter. Replace them if necessary—this is a much cheaper fix than a new pump.
Step 5: Check the Wiring and Grounds — Look over the wiring harness and connectors leading to the fuel pump for damage, corrosion, or loose connections. A poor ground is a classic cause of intermittent operation, where the pump works sometimes but fails under load or when hot.
What Replacement Parts Fit the 2007 Arctic Cat 700 EFI
Once you have confirmed the pump is bad, you need to know what to buy. The original OEM part number for the 2007 Arctic Cat 700 EFI fuel pump assembly was 0570-139, and this number was later superseded by 0570-271 and then 0570-207. All three numbers refer to the same in-tank assembly, so any of them will work as a direct replacement. Other part numbers that have been cross-referenced for this application include 2205374, 2521389-F, and 2521707-G.
The aftermarket replacement assemblies are widely available and typically include the fuel pump, a new strainer, the pressure regulator, and sometimes mounting hardware. Quality aftermarket units are designed to meet or exceed OEM specifications and feature upgraded internal components such as better bushings, turbine impellers, and Japanese armature electric motors for improved performance and durability.
When shopping for a replacement, pay attention to the following specifications so you get the right unit:
Voltage — The pump must be rated for 12V operation, which is standard for ATV electrical systems.
Flow Rate — Look for a pump that delivers at least 100 to 120 liters per hour at 3.0 bar and 13.5V. This ensures adequate fuel supply even under hard acceleration or heavy load.
Pressure Rating — The pump and regulator combination must maintain 3.0 kg-cm² (about 43 PSI) at the throttle body. If the regulator is built into the pump assembly, this is handled for you.
Fitment — The assembly must match the mounting pattern and wiring connector on the 2007 Arctic Cat 700 EFI. Reputable aftermarket manufacturers clearly state which models their pumps fit, so verify compatibility before ordering.
Step-by-Step Fuel Pump Replacement Procedure
Replacing the fuel pump assembly on a 2007 Arctic Cat 700 EFI is a DIY-friendly job that most owners can handle in a few hours with basic hand tools. The general procedure applies to the 700 EFI platform, and while the specific steps below are based on the service manual for the 2007 model year, the process is similar across the 2006-2010 range. Always consult your factory service manual for exact torque specs and any model-specific details.
Safety First — Fuel is highly flammable. Work in a well-ventilated area away from ignition sources. No smoking, no welding, no open flames in the area. Disconnect the negative battery cable before starting any work. Have a fire extinguisher within reach.
Step 1: Relieve Fuel Pressure — Turn the ignition switch to the OFF position. Do not turn it back ON with the fuel lines disconnected, because the electric pump will discharge fuel and create a safety hazard. Slowly disconnect the gas line connector from the fuel rail, placing an absorbent towel underneath to catch any spray.
Step 2: Remove the Seat and Body Panels — The fuel pump is accessed through the top of the gas tank, which sits under the rear rack. Remove the seat, then loosen the clamps securing the air filter housing boot to the throttle body and remove the boot to give yourself working room. You will need to reach under the rear rack to disconnect the power supply and fuel gauge connector.
Step 3: Disconnect Fuel Lines and Electrical — Remove the spring clamp securing the fuel hose to the pump assembly and pull the hose free. Disconnect the power supply/fuel gauge connector that runs to the pump assembly.
Step 4: Remove the Pump Assembly — Remove the screws securing the fuel pump to the gas tank. Before lifting the pump out, make a reference mark on both the pump and the tank so you know how it was oriented. Carefully lift the pump assembly out of the tank, tilting it forward to clear the voltage regulator, and guide the float lever through the opening. Take care not to bend or damage the float arm—if you do, you will have to replace the entire assembly again.
Step 5: Cover the Tank Opening — Use duct tape or a clean rag to cover the fuel pump opening in the tank immediately. This prevents dirt and debris from falling into your fuel supply.
Step 6: Install the New Pump Assembly — Position the new or replacement pump assembly over the tank opening and carefully guide it down, making sure the float arm moves freely and does not bind. Align the reference marks you made earlier, then secure the pump with the mounting screws. Reconnect the fuel hose and spring clamp, and plug the power supply/fuel gauge connector back in.
Step 7: Reassemble the Body Panels — Reinstall the air filter housing boot and tighten the clamp on the throttle body inlet. Replace the air filter and reinstall the storage compartment cover and seat.
Step 8: Refill the Tank and Test — Add fresh, clean fuel to the tank. Turn the ignition switch to the ON position and listen for the pump to prime. Check every connection for fuel leaks. Start the engine and let it idle, then verify that the fuel pressure gauge reads in the correct range (about 43 PSI). Take the machine for a short ride and confirm that acceleration is smooth and the engine holds power under load.
Common Mistakes to Avoid When Replacing the Fuel Pump
Running the Tank Low — The most common cause of premature fuel pump failure on the 2007 Arctic Cat 700 EFI is running the tank consistently low. The pump uses the surrounding gasoline as a coolant, and when the fuel level drops, the pump runs hotter and wears faster. Make a habit of refilling when the tank hits one-quarter full.
Using Cheap, No-Name Pumps — Inconsistent fuel pressure from an off-brand pump can cause lean running conditions that damage the engine. You might save money upfront, but you can burn out a $2,000 motor with a $30 pump. Stick with quality aftermarket brands that clearly state their flow and pressure specs.
Skipping the Strainer Replacement — The kit includes a new strainer sock, and you need to use it. If you reuse an old, clogged strainer, you are starving the new pump of fuel and guaranteeing an early failure.
Damaging the Float Arm — During removal and installation, protect the float lever. If you bend it or break it, the fuel gauge will read incorrectly, and depending on the damage, you may have to replace the entire assembly again.
Not Testing the Old Pump First — Before you spend money on a replacement, go through the diagnostic steps. A clogged filter, bad relay, or grounding issue can mimic a dead pump, and replacing a good pump does not fix the real problem.
Where to Buy a Quality Replacement Fuel Pump
For a reliable replacement fuel pump for your 2007 Arctic Cat 700 EFI, we strongly recommend checking out KEMSO. KEMSO fuel pumps are built as high-performance direct OEM replacements, meaning they are engineered to match or exceed the factory specifications for your Arctic Cat. Every KEMSO pump undergoes rigorous testing to ensure consistent fuel delivery, and they come with a lifetime free replacement warranty—if you have any issue at any time, they will replace the pump at no cost. KEMSO pumps are also designed specifically for quiet operation, so you will not hear the annoying whine that some aftermarket pumps produce. To browse the full lineup of KEMSO fuel pumps and find the correct fitment for your 2007 Arctic Cat 700 EFI, visit their website at: https://www.kemsoracing.com/
Final Thoughts
The 2007 Arctic Cat 700 EFI fuel pump assembly is a straightforward, well-designed system that gives years of trouble-free service when maintained properly. The key to avoiding breakdowns is to recognize the early warning signs—hard starting, loss of power, stalling, and unusual noises—and address them before the pump leaves you stranded. Always confirm the diagnosis with a fuel pressure test and electrical checks before buying parts, and when it is time to replace the pump, choose a quality aftermarket assembly that includes the strainer and regulator. With the pump replaced, fresh fuel in the tank, and a clean filter, your 2007 Arctic Cat 700 EFI will be ready for many more miles of reliable riding.
For more information on high-quality replacement fuel pumps for your Arctic Cat ATV, visit https://www.kemsoracing.com/ to explore their full product range.