According to ASMS standards, when must crane refueling be performed?

Crane refueling must be performed when the engine is not running to ensure safety and minimize the risk of fire or accidents. Refueling with the engine operational could lead to potential ignition of fuel vapors, which poses a significant hazard. Ensuring that the engine is off eliminates this danger, as there are no active ignition sources present. Additionally, without the engine running, the operational systems of the crane are not engaged, reducing the risk of unintended movement during the refueling process.

Refueling when the crane is idle, which may seem safe, does not adequately address the potential risks associated with an active engine. The time of day does not specifically govern the refueling process but is instead related to visibility and convenience rather than safety standards laid out in ASMS guidelines.