Predator 3500 Generator not firing,

Predator 3500 Generator Not Firing: Causes And Solutions

If you own a Predator 3500 generator and find yourself in a situation where it’s not firing up, it can be a frustrating experience. 

A generator that fails to start not only disrupts your plans but also hinders your ability to power essential appliances or equipment. 

Fortunately, several common issues could be causing the problem, and with the right troubleshooting steps, you can get your generator up and running again. 

With that, in this article, we’ll explore the potential reasons why your Predator 3500 generator is not firing and provide a step-by-step guide to help you resolve the issue.

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Why is the Predator 3500 Generator Different from Others?

Before we start talking about the troubleshooting process, let’s briefly familiarize ourselves with the Predator 3500 generator and why it’s different from other generators. 

The Predator 3500 is a portable inverter generator known for its reliability, efficiency, and quiet operation. 

It is commonly used for various applications, including camping trips, outdoor events, backup power during emergencies, and powering tools or appliances in remote locations. 

With its 3500-watt power output and inverter technology, the generator delivers stable and clean power suitable for sensitive electronics. Check out the current price of Predator 3500 Generator on Amazon

Common Reasons for Predator 3500 Generator Not Firing

When your Predator 3500 generator refuses to fire up, several potential issues could be at play. It’s important to diagnose the problem accurately to implement the appropriate solution. 

Let’s explore the common causes behind a generator not firing. But first, you need a complete generator carburetor service kits incase you have to change anything.

Insufficient Fuel Supply

One of the primary reasons for a generator’s failure to start is an insufficient fuel supply. Without an adequate amount of fuel, the engine cannot initiate the combustion process. 

Before assuming a more complex problem, you must ensure that your generator has enough fuel to operate. 

Checking the fuel level and refilling the tank, if necessary, is a simple yet often overlooked step in troubleshooting.

Clogged Fuel System

Even with sufficient fuel, a clogged fuel system can prevent the proper flow of fuel to the engine.

Over time, fuel can become contaminated with debris, resulting in clogged fuel lines, filters, or carburetor jets. 

When the fuel system is obstructed, the engine may struggle to receive the necessary fuel, leading to starting issues. 

Cleaning or replacing the fuel filter and inspecting the fuel lines for blockages can help resolve this problem.

Spark Plug Issues

The spark plug plays an important role in the combustion process by igniting the air-fuel mixture inside the engine. 

If the spark plug is faulty or worn out, it can prevent the generator from starting. A spark plug with worn electrodes or improper gap settings may not produce a sufficient spark to ignite the fuel. 

In such cases, replacing the spark plug with a new one and ensuring the correct gap is set according to the manufacturer’s specifications can often solve the problem.

Low Oil Level

Many generators, including the Predator 3500, are equipped with low-oil-level sensors as a safety feature. 

If the oil level is below the recommended threshold, the generator may not start to protect the engine from damage. 

Checking the oil level and adding oil, if necessary, can help resolve this issue. It’s important to use the recommended oil type for oil changes and maintenance.

Battery Problems

If your Predator 3500 generator has an electric start feature, a malfunctioning battery can prevent it from firing up. 

A weak or discharged battery may not provide enough power to crank the engine. But you can try firing it manually. If it fires, check the battery.

Checking the battery voltage using a multimeter and ensuring it is properly charged can help determine if the battery is the culprit. Recharging the battery or replacing it, if needed, should resolve the issue.

Valve Problems

Valve-related issues can also contribute to a generator not firing. Incorrect valve clearance or damaged/stuck valves can disrupt the combustion process and prevent the engine from starting. 

Checking and adjusting the valve clearance or inspecting the valve for any damage or blockage should be part of the troubleshooting process.

Ignition Coil Problems

The ignition coil is responsible for generating the high-voltage spark needed to ignite the air-fuel mixture in the engine. If the ignition coil is faulty or damaged, it can result in a weak or nonexistent spark, leading to starting problems. Testing the ignition coil using a spark tester and replacing it, if necessary, should resolve the issue.

Carburetor Issues

The carburetor is responsible for mixing the air and fuel in the correct ratio for combustion. If the carburetor is dirty, clogged, or improperly adjusted, it can hinder the engine’s ability to start. Cleaning or rebuilding the carburetor, ensuring proper adjustment of the air and fuel mixture screws, and inspecting the choke mechanism can help address carburetor-related starting issues.

Air Filter Blockage

A dirty or clogged air filter can restrict the airflow to the engine, resulting in starting difficulties. Inspecting the air filter and cleaning or replacing it, if necessary, is an essential troubleshooting step. It’s important to keep the air filter clean and free from debris to maintain proper engine performance.

Control Panel Malfunction

In some cases, a malfunctioning control panel or faulty components within the control system can prevent the generator from starting. Issues with the ignition switch, circuit breakers, or other control panel components may disrupt the electrical flow necessary for the engine to fire up. Checking the control panel for any visible damage or loose connections and ensuring proper functionality is important in diagnosing starting problems.

Wiring Problems

Faulty wiring or loose connections can also contribute to a generator’s failure to start. 

Damaged wires, corroded terminals, or loose electrical connections can disrupt the flow of electricity and prevent the engine from firing. 

Carefully inspecting the wiring harness, connectors, and terminals for any signs of damage or poor connections and addressing them accordingly should help resolve this issue.

Troubleshooting Steps to Fix Predator 3500 Generator Not Firing

Now that we have identified the potential causes for your Predator 3500 generator not firing, let’s delve into the step-by-step troubleshooting process to get your generator up and running again. 

Please note that these steps are provided as general guidelines, and it’s always advisable to refer to a professional for diagnosis if the issue persists.

Step 1: Check Fuel Level and Supply

The first step is to ensure that your generator has an adequate fuel supply. Check the fuel level in the tank and refill it if necessary. If you suspect that the fuel may be contaminated or stale, it’s advisable to drain the old fuel and replace it with fresh, clean fuel.

Step 2: Inspect and Clean the Fuel System

Inspect the fuel lines, fuel filter, and carburetor for any signs of clogging or blockage. Remove and clean the fuel filter, ensuring that it is free from debris. If the fuel lines or carburetor jets appear clogged, carefully clean them using an appropriate cleaner or solvent. Ensure that all components are reinstalled correctly after cleaning.

Step 3: Check and Replace the Spark Plug

Inspect the spark plug for any signs of damage, wear, or fouling. Replace the spark plug if necessary, ensuring that the new plug has the correct specifications and gap setting. Clean the area around the spark plug before reinstalling it.

Step 4: Verify the Oil Level

Check the oil level in the generator’s crankcase. Ensure that the oil level is within the recommended range. If the oil level is low, add the recommended oil type until it reaches the appropriate level.

Step 5: Test and Charge the Battery

If your generator has an electric start feature, test the battery voltage using a multimeter. If the voltage is below the recommended level, recharge the battery or replace it if necessary. Ensure that the battery connections are secure and clean.

Step 6: Inspect and Adjust Valves

Check the valve clearance by removing the valve cover. If the clearance is outside the recommended range, adjust it according to the manufacturer’s specifications. Inspect the valves for any signs of damage or blockage and address the issue accordingly.

Step 7: Test the Ignition Coil

Using a spark tester, check the ignition coil for spark. If there is no spark or a weak spark, replace the ignition coil with a new one compatible with your generator model.

Step 8: Clean or Rebuild the Carburetor

If the carburetor is suspected to be the cause of the starting problem, consider cleaning or rebuilding it. Remove the carburetor from the generator, disassemble it, and clean all the components thoroughly.

Pay attention to tiny orifices and jets that may be clogged. Reassemble the carburetor and reinstall it, ensuring that the air and fuel mixture screws are properly adjusted.

Step 9: Inspect and Clean the Air Filter

Inspect the air filter for any signs of dirt, debris, or clogging. If necessary, clean the air filter using compressed air or replace it with a new one. Ensure that the air filter housing is securely closed after cleaning or replacement.

Step 10: Check the Control Panel and Wiring

Inspect the control panel for any visible damage or loose connections. Check the ignition switch, circuit breakers, and other control panel components for proper functionality.

Carefully inspect the wiring harness, connectors, and terminals for any signs of damage or loose connections. Address any issues found during the inspection.


Dealing with a Predator 3500 generator that refuses to fire up can be a frustrating experience, but with the right troubleshooting steps, you can identify and resolve the issue. 

By systematically addressing potential causes such as insufficient fuel supply, clogged fuel systems, spark plug issues, low oil level, battery problems, valve problems, ignition coil problems, carburetor issues, air filter blockage, control panel malfunction, and wiring problems, you increase your chances of getting your generator back to optimal performance.

Frequently Asked Questions

1. How often should I change the spark plug in my Predator 3500 generator?

It is recommended to inspect and replace the spark plug in your Predator 3500 generator annually or after every 100 hours of operation, whichever comes first. 

2. Can I use ethanol-blended fuel in my Predator 3500 generator?

While some generators can tolerate ethanol-blended fuels, it is recommended to avoid using gasoline with more than 10% ethanol (E10) in the Predator 3500 generator. Higher ethanol blends can cause fuel system issues and affect the generator’s performance and longevity.

3. How can I ensure proper storage of my Predator 3500 generator?

To ensure proper storage, it’s important to drain the fuel from the tank and carburetor or use a fuel stabilizer to prevent fuel deterioration. Keep the generator in a clean, dry area and protect it from dust, moisture, and extreme temperatures.

4. What should I do if my Predator 3500 generator still doesn’t start after troubleshooting?

If your generator fails to start even after following the troubleshooting steps, it is recommended to seek professional assistance from a certified technician or contact the manufacturer’s customer support for further guidance and support.

5. Can I use aftermarket parts for repairs and maintenance of my Predator 3500 generator?

While aftermarket parts may be available for your Predator 3500 generator, it is generally recommended to use genuine OEM (Original Equipment Manufacturer) parts for repairs and maintenance. 


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