With diesels, there is (or should be) a low pressure return line. The system always sends more fuel than will actually be used as the engine runs. The fuel will recirculate either by sending the excess fuel all the way back to the engine’s fuel tank, recirculating it through the fuel injection pump, or on some engines via the engine-mounted fuel filter assembly (kind of polishing it).
Wondering if both engine's returns are going to the same tank. That could account for the difference.
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