What condition may cause a generator to wet stack?

Wet stacking occurs when a generator operates under a consistent low load for an extended period. In this situation, the engine does not reach its optimal operating temperature, which inhibits the complete combustion of fuel. As a result, unburned fuel can accumulate in the exhaust and lubricating oil, leading to a condition known as "wet stacking." This build-up can negatively affect engine performance and longevity, necessitating corrective maintenance.

Insufficient load prevents the generator from achieving the proper temperature and combustion efficiency, leading to incomplete combustion and ultimately, wet stacking. This implies that maintaining an appropriate load on the generator is essential for its efficient operation and helps to minimize harmful by-products that can arise from improper combustion.