Why Is My Generator Revving Up and Down? – Solving the Mystery

Why Is My Generator Revving Up and Down? – Solving the Mystery

A generator is a handy piece of equipment to have, especially during a power outage or when you’re off the grid. However, it can be quite concerning when your dependable generator starts revving up and down uncontrollably. In this blog post, we’ll take a closer look why is my generator revving up and down and what you can do to fix the problem.

The Governor System

The generator‘s governor is responsible for maintaining a stable engine speed while the generator is running. It does this by adjusting the engine throttle based on the generator’s load demand. When the generator begins revving up and down, the first thing to check is the governor system. If you’re curious about how long will a propane generator run, there are a few factors to consider such as the size of the propane tank and the generator’s fuel efficiency.

  • Inspect the governor linkage for any signs of damage, looseness, or obstruction.
  • Verify that the governor spring is connected and has the correct tension.
  • Check the governor’s adjustment settings, and refer to your generator’s manual for proper adjustment procedures.

Fuel Supply Issues

A fluctuating fuel supply can also be the cause of a generator revving up and down. Ensure that there is a consistent flow of fuel to the engine.

  • Check the fuel level in the tank and fill it if necessary.
  • Inspect the fuel lines for any signs of damage or blockage.
  • Clean the fuel filter and replace it if necessary.
  • Ensure that the fuel cap is properly vented, as a clogged vent can cause a vacuum to form in the tank, disrupting the fuel flow to the engine.

Air Filter and Spark Plugs

A dirty air filter or worn spark plugs can limit the engine’s performance, causing fluctuations in engine speed. Regular maintenance can help prevent these issues.

  • Check and clean the air filter or replace it if it’s too dirty.
  • Inspect the spark plug and replace it if it’s worn or damaged.

Carburetor Issues

A generator’s carburetor helps mix the right amount of fuel and air for optimal combustion. However, it can become clogged or malfunction, leading to an unstable engine speed.

  • Inspect and clean the carburetor, paying attention to the jets and needle valves.
  • Adjust the carburetor settings as advised in your generator’s manual.
  • If the carburetor is beyond repair, consider replacing it.

Exhaust System Problems

An obstructed or damaged exhaust system can hinder the engine’s performance and cause the generator to rev up and down.

  • Check the exhaust pipe and muffler for any blockages or damage.
  • Ensure that the exhaust system is properly vented to allow the engine to breathe efficiently.


A generator revving up and down can be a cause for concern, but by addressing the potential issues listed above, you can restore your generator to its normal performance. Remember that proper maintenance will help keep your generator running smoothly and prevent potential problems in the future.

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