Engine : General Subjects - 1251/1128
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| If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause? |
| A) The discharge valve is clogged. |
| B) The wearing rings are excessively worn. |
| C) The suction strainer is clogged. |
| D) The shaft is worn. |
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