Why Is My Generator Sputtering?

Carburettor issues make your generator sound like it’s struggling or starting to sputter while it’s operating. It occurs due to fuel clogging and sticking to the carburettor.

It’s advisable to have a fuel backup instead of leaving it inside the system for an extended period. Fuel left in the system will eventually evaporate and leave sticky elements behind.

Ultimately, the sticky element jams the carburettor and stops the engine, which is usually the main reason for sputtering. The common reasons that make your generator sputter include:

Carburettor Defect

The main issues with generators begin with carburettor defects whereby fuel combines with air and is transmitted to the combustion chamber. It is worth noting that the carburettor regulates the amount of air and fuel required for ignition.

Suppose your generator has a faulty carburettor. In that case, it doesn’t mix the fuel and air in appropriate proportions, meaning it will start to sputter and fail to generate the necessary power. Blockages in the carburettor cause this problem.

Leaving fuel in the system for a more extended period than it should be can cause carburettor blockages.

Usually, some fuel will evaporate, the remnants will absorb moisture, and, in the process, get stuck and jam the carburettor.

Damaged Spark Plug

A spark plug is an essential part of the generator system as it offers the electrical spark required for ignitions in the combustion area. A malfunctioning spark plug means the fuel and air combination will not ignite correctly.

It makes the generator operate roughly. The worst-case scenario is that a spark plug that fails to spark constantly results in the system breakdown. Cracks on the porcelain insulator or jammed or burned electrodes lead to faults in the spark plugs.

Fuel Filter Blockage

A blocked fuel filter is another major cause of generator sputtering. This system filters out debris and dirt from the fuel transported to the carburettor and later to the combustion section for ignition.

Only clean fuel must reach the carburettor. As the fuel filter system keeps on removing debris and dirt, the sieves will ultimately get jammed up with the trashes at some point.

The trashes in the filters lead to less fuel in the carburettor and hence the sputtering effect. It would help if you considered correcting the situation immediately to avoid total generator failure as the lines may become wholly clogged up.

Stale Fuel

If your generator has unused fuel that stays in the system for several months, the fuel may start absorbing moisture and become stale.

Some parts of the fuel may evaporate and, in the process, leave an ineffective and sticky element behind.

Can You Fix a Sputtering Generator?

Yes. Here are the steps you can follow.

Fix the Carburettor

You will have to detach the carburettor first to fix any associated issues. Examine all carburettor parts for problems and solve them.

Also, check the electrical circuits and assess the pipes and valves connected to the carburettor. Lastly, carefully clean the carburettor with a top-quality carburettor cleaner to get rid of debris and caked-up fuel.

Afterwards, reattach the carburettor and evaluate the generator. However, your generator may have an enormous issue that is hard to solve via this simple procedure.

If that is the issue, you will need to look out for professional assistance. You might also need to replace the faulty carburettor with a new one.

Evaluate the Spark Plug

You can assess if the spark plug has any issues. The main problems with spark plugs originate from insulator cracks, burned electrodes, or dirt build-up on the electrode.

Consider assessing the spark plug’s physical appearance to determine whether you can see dirt on the electrode. Use a knife or similar item to remove this dirt and then use petrol rather than water to clean it.

Dry it completely before reinstalling it. You might need to buy a new spark plug if there are cracks. When determining a burned electrode, you have to assess whether the plug works correctly or not.

In this step, use a spark tester. Else, while the engine is still running, connect one end of the plug to an electrical circuit and ensure the other touches the crankcase.

The spark plug is working fine if you notice a strong blue spark. However, a weak one indicates it needs replacement.

Assess and Clean the Fuel Filter

Next, check out if the fuel filter is fully functional. Please switch off the generator and let it cool off completely.

Afterwards, examine the fuel line that drips from the fuel filter. The fuel valve should be open throughout this test.

A properly working fuel filter should have a steady flowing line. If you notice indecisive results, you will need to detach and clean the fuel filter.

Close the fuel valve, detach the filter, and use petrol to clean. Please wait for it to dry completely before reattaching.

Reduce Loads

It would help if you never overload a generator. Disconnect some electronic gadgets if your generator starts to sputter.

Drain and Replace Fuel

You should drain fuel that has overstayed in the system and replace it with a new one. Furthermore, you should run the generator for about three hours once each month to drain the fuel.

Why is My Generator Sputtering?

Your generator could be sputtering due to a blocked fuel filter and carburettor. Overloading the generator and faulty spark plugs are other reasons for making your generator sputter.