Generac GP8000E Problems : 5 Common Issues (Solved)

The Generac GP8000E is a powerful portable generator that provides a convenient source of backup power during emergencies or when you’re on the go. With its high-quality components, it’s designed to deliver consistent performance and withstand the rigors of demanding electrical power generation. However, the Generac GP8000E may encounter problems from time to time and in this article, we will look at  some of the common problems user may face with this generator and how to solve them. Let’s get into it

Table of Contents

What Is The Generac GP8000E?

The Generac GP8000E is a portable generator that is specifically designed to provide reliable power in a variety of situations. With a maximum output of 8000 watts, it is capable of running multiple appliances and tools simultaneously, making it ideal for both residential and commercial use. It is equipped with a powerful 420cc OHV engine and it delivers robust performance and can handle a variety of heavy loads with ease. The Generac GP8000E has an electric start which allows for easy and convenient operation and it is also equipped with a low-oil shutdown system to protect the engine from damage.

Generac GP8000E Problems

1. Starting Problems

Some of the most common reasons why a Generac GP8000E generator may have trouble starting is because of;

  • Low fuel
  • A worn-out or dirty spark plug

Troubleshooting Engine Starting Problems

  • Make sure that there is enough fuel in the tank to power the generator. If the fuel level is low then you will have to refill it with fresh gasoline. (It is recommended to use a fuel stabilizer to prevent the fuel from deteriorating.)
  • Inspect the spark plug and ensure that it is clean and in good condition. If not then you should replace the spark plug with a new one that is compatible with the generator.

2. Low Power Output Problem

If the Generac GP8000E is running but not providing power to your appliances then the generator may have an issue with;

  • The circuit breakers
  • The outlets or wire connections

Troubleshooting The Low Power Output Problem

  • You first need to locate the circuit breakers on the control panel of the generator and ensure that they are in the ON position. If any of the circuit breakers are in the OFF position then reset them by switching them to the ON position.
  • Make sure that the outlets on the generator are clean and free from any debris or obstructions. If the outlets are dirty, use a clean cloth or brush to remove any dirt or debris.
  • Also check all the connections between the generator and your appliances to ensure that they are secure and properly plugged in.

3. Fuel-Related Issues

Fuel-related issues are the main culprit for causing performance problems with the Generac GP8000E generator and they are usually a sign of;

  • A dirty fuel filter
  • Dirty fuel in the tank
  • A clogged carburetor

Troubleshooting Fuel-Related Issues

  • Be sure to locate the fuel filter and inspect it for any signs of dirt or debris and if the fuel filter is dirty then replace it with a new one to ensure proper fuel flow.
  • You may have to drain the fuel tank completely and dispose of the old fuel properly. Refill the tank with fresh, clean gasoline to make sure you have optimal engine performance.
  • Remove the carburetor and clean it thoroughly using carburetor cleaner and a soft brush. Pay special attention to the small ports and jets to ensure they are clear of any debris.

4. Engine Issues

There are a number of factors that lead to engine problems with the Generac GP8000E generator and they include;

  • Low engine oil levels
  • A clogged air filter
  • Damaged or loose engine components

Troubleshooting The Engine Issues

  • Check the engine oil level using the dipstick and ensure that it is within the recommended range. If the oil level is low then add the correct type and amount of oil as guven in the Generac GP8000E generator’s manual.
  • Be sure to remove the air filter and inspect it for dirt or debris and if the air filter is dirty then you need to clean it or replace it with a new one to ensure proper airflow.
  • Also be sure to inspect the engine and other components of the Generac GP8000E for any loose or damaged parts. Tighten any loose bolts or connections and replace any damaged components as necessary.

5. Electrical System Problems

Electrical system problems can lead to the Generac GP8000E not working completely as the generator requires its electrical components to operate effectively. These electrical system problems are usually because of;

  • A faulty voltage regulator
  • Faulty internal wiring
  • A faulty control panel

Troubleshooting The Electrical System Problems

  • Be sure to regularly test the voltage regulator using a multimeter to ensure that it is functioning properly. If the voltage regulator is not working correctly then it will need to be replaced.
  • Check all the wiring connections in the electrical system of the Generac GP8000E and make sure that all connections are secure and free from any damage or corrosion.
  • Always refer to the generator’s manual for instructions on how to reset the control panel as resetting the control panel can often resolve minor electrical system issues.

How To Avoid Problems With The Generac GP8000E

  • Change the oil regularly as recommended in the generator’s manual.
  • Clean or replace the air filter regularly to ensure proper airflow.
  • Inspect and tighten all bolts and connections to prevent loose parts.
  • Keep the generator clean and free from dirt, debris and moisture.
  • Store the generator in a dry and well-ventilated area when not in use.
  • Use fresh gasoline and a fuel stabilizer to prevent fuel-related issues.
  • Test the regularly periodically to ensure it is in proper working condition.

How Often Should I Change The Oil In My Generac GP8000E?

The oil in the Generac GP8000E should be changed after the first 30 hours of use and then every 100 hours or once a year, whichever comes first. However, if you are using the generator in extreme conditions or for extended periods then more frequent oil changes will be necessary.

Can I Use The Generac GP8000E In Wet Conditions?

The Generac GP8000E is designed for outdoor use, but it should not be operated in wet or rainy conditions because water can damage the electrical components of the generator and pose a safety hazard. To protect your generator from moisture, always operate it in a dry and well-ventilated area.


The Generac GP8000E is a reliable and powerful portable generator that can provide you with a convenient source of backup power. However, it is not immune to problems that may arise from time to time. By understanding the common issues and following the troubleshooting tips that are in this article you can effectively diagnose and resolve many of the problems you may encounter with your Generac GP8000E generator.