Detroit Diesel — When all the tests are completed, the test equipment removed, and all repairs/replacements

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

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Procedure

1. Fitting
2. Fuel Outlet Line
3. Fuel Filter Housing
4. Unit Pump
5. Mechanical Gauge

Source: manual:mbe_4000_ddec_vi.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.