Perkins — Replace the parts if any of the following conditions

A Perkins service procedure — check it applies to your exact model before use.

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Procedure

1. High pressure fuel line or lines are removed.
2. End fittings are damaged or leaking.
3. Outer coverings are chafed or cut.
4. Wires are exposed.
5. Outer coverings are ballooning.
6. Flexible part of the hoses are kinked.
7. Outer covers have embedded armoring.
8. End fittings are displaced.

Source: manual:Perkins Operation and Maintenance Manual 1106D Industrial Engine.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.