Common Reasons for Diesel Generators Not Starting

Introduce

Diesel generators are reliable backup power sources for a wide variety of industrial, corporate and residential properties. They play a key role in ensuring essential services continue to run during blackouts or in remote areas without access to the grid. BISON, a leading manufacturer, exporter and wholesaler of diesel generators understands the importance of reliable generators. However, like any other piece of machinery, they sometimes face issues, including failure to start. Knowing the common reasons why a diesel generator won't start is essential for proper maintenance and troubleshooting. In this blog, we'll discuss some of these reasons and provide tips to prevent such problems.

Common reasons for diesel generators not starting

Fuel Tank Low fuel level

Maintaining a sufficient fuel supply is crucial for diesel portable generators to operate effectively. If the fuel tank runs empty, it's one of the most frequent reasons why the generator may fail to start, stall, or abruptly shut down.

It's vital to check the diesel level in your generator tank before initiating it, in order to avoid this problem. Consistently monitor the fuel gauge and replenish the tank when required. It's also a good idea to have a fuel management system or schedule in place to ensure you never accidentally run out of fuel. BISON diesel generators are designed with user-friendly fuel gauge and efficient fuel consumption to help you manage fuel levels effectively.

Battery problem

A low or dead battery may prevent the diesel generator from starting. The starter motor relies on the battery for electrical energy to activate the engine. Low power supply from the battery will hinder diesel generator startup.

Check the battery and its connections regularly to make sure it is clean and safe. Corroded or loose connections can block the flow of electricity and cause starting problems. Check the charge of the battery with a battery tester and replace the battery if it no longer holds charge or has reached the end of its life. Ensure peak battery performance by confirming your charging system is functioning optimally. BISON diesel generators boast superior charging systems and first-rate batteries for dependable starting capabilities.

There is air in the fuel system

Air in the fuel system can prevent the generator from starting. This problem often occurs after changing the fuel filter or after running out of fuel. If air enters the fuel system, an airlock can form, preventing fuel from reaching the engine's combustion chambers.

Bleeding the air out of the fuel system can solve this problem. Refer to the relevant alternator manual for specific instructions on how to bleed air from the fuel system. Generally, the procedure involves loosening the bleed screw on the fuel pump or injector to allow air to escape until a steady flow of fuel is observed. After the air is exhausted, tighten the bleed screw and try to start the diesel generator again.

The spark plug needs to be replaced

To maintain optimal performance, it is important to regularly replace the spark plug in your BISON generator. Over time, deposits and buildup can accumulate on spark plugs, affecting their effectiveness. Using the spark plug wrench provided with your generator, remove the spark plugs and inspect them for any deposits. If necessary, use a knife or similar tool to clean the spark plugs. Ensure that the electrodes are correctly spaced, referring to the specifications page in the manual for your specific model. 

Starter motor failure

A faulty starter motor can also cause the diesel generator to fail to start. The engine cranking process is powered by the starter motor. In the event of a malfunction, both the diesel engine and the generator it powers will fail to initiate.

Check the starter motor for any obvious damage or wear, such as damaged or worn gears, frayed wires, or corroded connections. If you suspect a faulty starter motor, have it tested by a qualified technician and replace if necessary. Also, make sure the starter solenoid that engages the starter motor is working properly. BISON diesel generators use high-quality starter motors and solenoid valves to ensure consistent and reliable starting performance.

Fuel filter clogged

A clogged fuel filter can restrict fuel flow to the engine, preventing the generator from starting. Fuel filters are designed to remove pollutants and debris from diesel fuel before it reaches the engine combustion chamber. Over time, the filter can become clogged with debris, reducing fuel flow and causing starting problems.

Check and replace fuel filters regularly to ensure proper fuel flow. Refer to the diesel electric generator manual for specific recommendations on filter change intervals. It is also important to use clean, high-quality diesel fuel and store it properly to minimize the risk of contamination that can cause fuel filter clogging.

Contaminated fuel

Contaminated fuel, such as water or debris in diesel, may prevent a diesel generator from starting. Water in fuel can cause poor combustion, while debris can clog fuel filters and injectors, blocking fuel flow. Contaminated fuel can also cause corrosion and damage to various components within the fuel system and engine.

Always use clean, high-quality diesel and store it properly to avoid contamination. Store diesel in a cool, dry place away from direct sunlight and moisture. Use dedicated fuel containers and dispensing equipment to minimize the risk of introducing contaminants during refueling. Regularly inspect fuel storage tanks for signs of contamination, such as ponding or sediment, and address any issues promptly. BISON diesel generator is designed with advanced fuel filtration system, which helps to protect the engine from fuel pollution.

Engine overheating

An overheated diesel engine can also prevent the generator from starting. Excess heat can cause various components within the engine to expand, leading to reduced clearances, increased friction and potential seizure. In some cases, the engine's protective mechanism may hinder it from initiating if it perceives an overheating circumstance.

Make sure your diesel engine stays cool within the recommended temperature range by regularly inspecting and maintaining the cooling system. This includes checking the radiator, coolant level, and hoses for any damage or leaks. Keep debris from blocking airflow by cleaning the radiator fins, and ensure the coolant is at the right level. If you're unsure about any issues, it's best to ask a qualified technician for a proper diagnosis and solution.

Low engine oil level

The presence of an adequate amount of engine oil in diesel generator is vital, as it serves the crucial function of lubricating generator's moving parts, guaranteeing their smooth operation. If the oil level is too low, it will cause excessive friction and make it difficult to start the generator. Check the engine oil level regularly using the dipstick provided and add oil if necessary. The recommended type and grade of oil specified by the manufacturer must be used.

Cables not plugged in

One of the most common reasons a diesel generator won’t start is that the power cord isn’t connected properly. Make sure cables are securely plugged into generator and power source.Double check that all connections are tight and not damaged in any way. Also, check the cables for any signs of fraying or fraying, as this can also lead to a poor electrical connection.

Precautions and Maintenance Tips

To prevent common problems that prevent diesel generators from starting, follow these maintenance tips recommended by BISON:

• Check fuel level regularly and top up as needed.

• Keep the battery and its connections in top condition with regular checks.

• Bleed air from fuel system if necessary.

• Replace the fuel filter according to the manufacturer's recommendations.

• Use clean, high-quality diesel and store it properly.

• Inspect and maintain cooling systems.

• Regular inspection and maintenance of all generator components.

In addition to these precautions, it is also important to be familiar with the operation and maintenance manual of the diesel generator set. This manual will provide specific instructions and recommendations for your generator model to ensure optimum performance and reliability.

In summary

Knowing the common reasons why a diesel generator won't start is essential for proper maintennce and troubleshooting.Take steps towards avoiding generator starting issues and guarantee reliable backup power when you need it most by implementing the preventive measures and maintenance tips provided in this blog.

A diesel generator that's well-maintained can be a valuable asset, offering peace of mind and safety when power or grid outages occur. To keep your generator running smoothly and extend its life, invest time and effort in proactive maintenance that addresses potential issues. Trusted BISON is a leading diesel generator manufacturer, Exporter and Wholesaler of high quality, reliable generators that stand the test of time.