How to Test a Fuel Pump in a Snowmobile

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A snowmobile is used for fun and entertainment, work, or merely as a source of transportation. However, as with any vehicle, there is maintenance that must be performed to ensure that it functions properly. One part of a snowmobile that must be tested to ensure proper operation is the fuel pump. The fuel pump regulates the amount of fuel that is supplied to the engine from the tank, and helps control how smoothly your snowmobile runs.

Items you will need

  • Vacuum gauge

  • Any tools required to remove the engine body casing of your snowmobile (varies based on model)

Remove the body of the snowmobile in order to expose the fuel pump, engine and carburetor. This is as simple as lifting your engine cover or may require removing bolts.

Remove the tubing connecting the fuel tank to the fuel tank inlet on the fuel pump.

Attach the vacuum gauge to the fuel tank inlet.

Crank your engine.

Check the gauge to see if a vacuum is reported when the engine is cranked.

Remove the tubing connecting to the crankcase of the engine.

Verify that there is a pulse in the hose.

Remove the line that attaches from the pump to the carburetor.

Attach the gauge to this line and ensure that there is pressure when the engine is cranked.


  • If there is no vacuum on the fuel intake end of the pump, then your pump is defective. If there is a vacuum on the intake and a pulse in the crankcase, but no pressure to the carburetor line, then your pump is defective as well. If there is a vacuum on the fuel intake, pulse in the crankcase hose, and pressure on the carburetor line, check all of your tubing to ensure that there are no leaks or cracks.
  • If your fuel pump is malfunctioning, you have the option of using a rebuild kit to repair it rather than buying a new one.