Mobile Pump Operator Practice Exam 2025 – The All-in-One Guide to Mastering Your MPO Certification!

Question: 1 / 400

How long can you prime using an oil-less primer as long as your engine is running?

For a short period only

Indefinitely

When using an oil-less primer while the engine is running, it can be utilized indefinitely. This is because an oil-less primer is specifically designed to operate without the need for oil lubrication, allowing it to reliably pull water without the risk of damage from prolonged use. The engine's running state provides the necessary pressure for effective priming, and as long as the engine is operating correctly and not experiencing any mechanical failures, the primer can continue functioning without a set time limit.

This ability to operate indefinitely makes oil-less primers advantageous in situations where extended priming might be necessary, such as during emergencies where continuous pumping is required to manage water flow. This is in contrast to other priming methods that may have operational limits depending on various factors, such as engine performance or operational safety protocols.

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