Code 2215 low fuel pressure

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You are checking for pressure at the gear pump inlet - That test point will show lift pump pressure with the engine off, but once you start it, there will be a significant vacuum there caused by the gear pump. Your pressure gauge has likely been ruined or at least pulled out of calibration by the vacuum.

Test gear pump outlet pressure at the fitting on the front of the pump below the ECM cooling plate feed pipe.

Check rail pressure at the bottom of the IFSM right up the front. The fitting points down.