How many inches of vacuum should you use to test an oil suction line?

To effectively test an oil suction line, it is essential to create a sufficient vacuum to ensure that the system can operate correctly without any air infiltration, which could diminish the performance of the oil system. A vacuum in the range of 20 inches is typically specified for this purpose.

Using 20 inches of vacuum allows for an adequate assessment of the oil line integrity and helps identify potential leaks. This level of vacuum ensures that any issues can be detected while still being a standard practice in the industry for oil suction lines. A vacuum that is too low may not effectively reveal leaks, whereas a higher vacuum, such as the highest option, might not be practical and could risk causing damage to the line or connected components.

Thus, maintaining a vacuum of 20 inches strikes a balance between thorough testing and equipment safety, making it the appropriate choice for this application.