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Hello my name is ***** ***** am I speaking with?
When was the last time the impeller was changed?
What do you mean by air visible in the pipes? Did you replace the black hoses with clear tubing for testing?
Hello. My name is Tan. Lots of air in the discharge can be caused by an air leak on the suction side of the raw water pump. Check that the gasket or o-ring are making a good seal on the raw water strainer.
Did you inspect the water pump housing for grooves in the pump housing and the cover plate? Is the raw water pump dripping when the engine is running?
Is the vacuum valve on the suction side of the raw water pump?
Ok talk later.