E 350 V8-6.0L DSL Turbo (2007)
8. Disconnect the fuel return tube from the regulator cover.
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To install, tighten to 43 Nm (32 lb-ft).
9. WARNING: Clean all fuel residue from the engine compartment. Failure to follow these instructions may result in personal injury.
Remove the screws and the fuel pressure regulator cover.
10. Remove and discard the fuel pressure regulator cover O-ring seal.
11. Remove the spring and poppet valve.
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Inspect the fixed orifice for foreign material.
12. Clean the fuel pressure regulator bore in the fuel filter housing.
13. To install, reverse the removal procedure.
