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For EMD diesel locos GP & SD models 30 to 50 what was prototype practice regarding round fuel pressure gauge and protruding fuel sight glass? Both on both sides of fuel tank or just one side? If one side, which side was more common? What percentage of roads used both? Just the pressure gauge? Just the sight glass? Why were both needed; OR what is the function of the fuel sight glass--how is it different from the pressure gauge? I understand fuel filler pipes were used on both sides, so it would make sense that gauges would be used on both sides.
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