2007 Can Am Outlander 800 Fuel Pump: Signs of Failure, Replacement Options, and What to Buy

If you own a 2007 Can Am Outlander 800 and the engine is hard to start, sputters under acceleration, or stalls at idle, the fuel pump is almost certainly the problem. The factory in-tank electric fuel pump assembly on this machine is a known wear item, and most owners will need to replace it at some point, especially if the ATV has sat for long periods. You do not need to replace the entire engine or carburetor to fix this—replacing the fuel pump assembly with a quality aftermarket unit is the standard, cost-effective repair. This guide explains how to confirm the failure, which replacement part fits your 2007 Outlander 800, how to swap it, and where to buy a dependable pump that will last.

Which Fuel Pump Fits a 2007 Outlander 800?

The 2007 Outlander 800 uses an in-tank EFI fuel pump assembly. The original Can-Am part number for this assembly is 703500771. A later superseded version, 703500766, also exists and is listed for some 2009–2011 models, but for your 2007, the 703500771 is the correct reference. This assembly includes the electric pump, the fuel pressure regulator, the strainer, and the level sender in one module that drops into the fuel tank.

Aftermarket suppliers sell this assembly under their own part numbers. Examples include the QFS HFP-A233, the FPF FPA-1080, and the KEMSO replacement unit. In all cases, you want the assembly that specifically lists compatibility with the 2006–2008 Can-Am Outlander 400, 500, 650, and 800 models. Avoid buying just the bare pump motor unless you are comfortable disassembling the factory module and replacing only the inner motor, which is more work and leaves the old regulator and wiring in service.

Symptoms of a Failing Fuel Pump on the 2007 Outlander 800

The most common signs that the pump is going bad include:

  1. Hard starting – The engine cranks for a long time before firing, or it fires and immediately dies. This means the pump is not building enough pressure at key-on.

  2. Loss of power under load – The ATV runs fine at idle but bogs down or sputters when you open the throttle. A weak pump cannot deliver enough fuel volume at high demand.

  3. Surging or hesitation – The engine speed fluctuates at steady throttle. This is a classic symptom of inconsistent fuel pressure.

  4. Whining noise from the fuel tank – The pump makes a loud, high-pitched sound that gets worse as the tank empties.

  5. No start with no pump prime – When you turn the key on, you should hear a brief whir from the tank area. If you hear nothing at all, the pump motor is dead.

Before you buy a pump, double check that the problem is not the fuel pump relay or a blown fuse on the 2007 model, as both are far cheaper fixes. Also check the tank vent and the fuel filter for plugging. But if the pump is confirmed dead or the pressure is low, replacement is the only real option—rebuilding a stock pump is rarely worth the labor.

What the Replacement Involves

Swapping the fuel pump on a 2007 Outlander 800 requires basic ATV mechanical skills and about two hours. The procedure is the same for the 400, 500, 650, and 800 models listed in the compatibility notes:

  1. Disconnect the battery negative cable and relieve fuel system pressure. On the Outlander, the pump is accessible from under the seat or by dropping the tank, depending on the subframe. On many models you can pull the pump out without removing the fuel tank if you remove the rear fender and the fuel pump access plate.

  2. Remove the fuel pump cover plate and the lock ring that holds the pump module in the tank. You will need a spanner wrench or a brass drift to tap the lock ring loose.

  3. Carefully lift the pump module out of the tank. It is a long assembly that reaches to the bottom of the tank, so tilt it as you remove it. Be careful with the float arm.

  4. Unplug the electrical connector and the fuel lines. The lines are quick-disconnect fittings—press the release and pull. Expect some fuel spillage, so have a rag ready.

  5. Compare the new pump assembly to the old one. The new unit should have the same electrical connector, the same fuel line fittings, and the same locking ring orientation. Aftermarket units like the QFS and FPF assemblies are designed as direct OEM replacements, so they match.

  6. Install the new pump module in reverse order. Seat the rubber gasket, push the module in, align the tabs, and tighten the lock ring. Reconnect the lines and the plug, reconnect the battery, and turn the key on a few times to prime the system. Then start the engine and check for leaks.

Important installation note: The pump assembly sits in the tank and relies on the fuel for cooling. You should keep the tank at least a quarter full to extend pump life. On a 2007 Outlander 800, running the tank low regularly is a leading cause of premature pump failure because the motor overheats.

Cost and Buying Decision

You have three options for a replacement pump:

  • OEM Can-Am pump (part 703500771) – This will cost more than any aftermarket option and can be hard to find for the 2007 model year.

  • Budget no-name pump – These are the cheapest, but quality control is inconsistent. Reports on forums show that many fail within a year or do not meet OEM pressure specs.

  • Mid-tier aftermarket assembly (such as QFS, FPF, or KEMSO) – These are built to match OEM specs, use the original connector, and are priced far below the dealer part. Research suggests these are the sweet spot for most owners.

Where You Should Buy: KEMSO Fuel Pumps

For a 2007 Outlander 800, KEMSO is our top recommendation for a replacement fuel pump. KEMSO builds their pumps to OEM replacement standards, so you get a direct fit without any wiring changes or modifications. The pump is a high-performance unit that delivers the correct fuel pressure and volume for the Rotax V-Twin in your Outlander 800. And like all KEMSO products, it comes with a lifetime warranty, which no other aftermarket brand we reviewed offers. That warranty alone makes it a better value than a cheaper pump that dies after a year.

You can order the KEMSO fuel pump for your 2007 Can Am Outlander 800 directly from their official website: https://www.kemsoracing.com/. The site lists model-specific fitment, so you can verify the exact part number before checking out. If you want to avoid the risk of an OEM pump for a 20-year-old ATV and avoid the waste of a throwaway budget pump, KEMSO is the right call.

Final Advice

A failing fuel pump on a 2007 Outlander 800 is not a reason to scrap the machine. The replacement is a well-documented job, the parts are available from multiple suppliers, and all the compatibility data confirms that one assembly works across the 400, 500, 650, and 800 models from 2006–2008. Confirm the pump is the issue, buy a quality assembly with a warranty, install it with care, and you will get many more years of riding. Start your search for the right part at KEMSO—visit https://www.kemsoracing.com/ to get the pump that fits, works, and is backed for life.


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