Which tool should be used to torque line nuts?

Using a line wrench is the correct choice for torquing line nuts due to its specific design, which provides a secure grip on the nut while allowing access in tight spaces where traditional wrenches may not fit. Line wrenches typically have a unique shape, often resembling a combination of an open-end and a box-end wrench, with a slot cut into the head. This design allows the wrench to fit over the line, making it ideal for situations involving hoses or pipes connected to the nut.

The importance of using a line wrench is emphasized when working on fuel or hydraulic lines, where excessive force or slipping can damage the connection or even the line itself. The design of the line wrench minimizes the risk of rounding the nut's corners, which can happen with other types of wrenches.

By choosing a line wrench, you ensure that you're applying torque effectively and safely, which is crucial in maintaining the integrity of the system you are working on.