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It's funny. The ancient Egyptians built there great monuments using water as a level 5000 years ago, and it still is relevant today ! The modern diesel manufactures took a note from mechanics (like Guyfang) on indirectly testing compression by this method. This way they could adjust performance...

That's one of the tricks we use to test our diesel engines. Though our engines already come with quick-connects to the valve covers. In fact several engine manufactures have pressure sensors mounted there to monitor the engines performance. Along with manifold sensors (intake and exhaust) and...

Another possibility is the one-way check valve before the injection pump. If this is dirty it could be holding up the valve and allowing the fuel to drain back. Or the injectors could be dirty. Or the filters plugged or the fuel pumps filters dirty or pumps not working properly. All these...