Which of the following is true regarding generators?

The statement regarding unused fuel returning from the engine being discharged into the main fuel tank when the day tank is of small capacity is accurate and reflects common practices in the operation of generators. In generator systems, particularly those that utilize day tanks for holding fuel, effective management of fuel is essential to ensure efficient operation.

When the day tank, which supplies the generator with fuel, reaches its capacity and cannot hold any more fuel, the return line from the engine can redirect excess fuel back to the main fuel tank. This process helps to prevent fuel waste and ensures that the system continues to operate smoothly without interruptions caused by fuel shortages. Properly managing fuel flow is crucial for sustained generator performance and efficiency.

The other statements contain misunderstandings or misconceptions about generator operation. For example, generators typically operate effectively at various load levels but can face performance issues if consistently run at very low load levels, although seizing is not a common issue at under 30% load. Additionally, the frequency of gasoline generator usage can vary significantly based on context, cost efficiency, and application needs. Therefore, understanding fuel management and operational parameters is key to effective generator use.