What critical information must the engine MPO receive from the truck operator when supplying a truck without a pump?

The correct answer focuses on the crucial information that allows the mobile pump operator (MPO) to effectively supply water to a truck that does not have a pump. Knowing the psi needed at the truck intake and the gallons per minute (GPM) flowing is essential for several reasons.

First, the psi (pounds per square inch) specifies the pressure that the water needs to be supplied at for the truck to function correctly. If the pressure is too low, the system may not operate effectively, and if it's too high, it could damage the equipment or lead to dangerous situations. Understanding the required GPM is equally important, as it indicates how much water flow is necessary to meet the operational demands of the firefighting effort.

Without this critical information, the MPO may struggle to maintain the necessary pressure and flow, which could impede firefighting operations and potentially compromise safety on the scene. Thus, this specific information enables the MPO to make necessary adjustments to ensure that water supply is both efficient and effective.