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Very small diaphragm leak in a manual fuel pump or a very small leak at a joint such as fuel filter, fuel filter seal etc. My guess would be a pump leak allowing a little air in...very common with diesel engines. Generally a sign of the pump on the way out.
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Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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