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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1570102" data-attributes="member: 29141">Does the level in the reservoir change noticeably between cold engine off and when it's been operating for a while? This could indicate an air pocket and thus pump cavitation. Keep in mind that a groan can travel through the system and into a solid mass such as the hydroboost. Were you able to pressure test the new AN line before installing it? Summitt has an AN pressure test kit, it caps off one end of the AN line and the other has a schrader valve on it.I never liked the Ford C-III style of pump. I went through three new Lares aluminum pumps a couple years ago, they all screamed above 3k rpm. I got rid of them all and went with the GM type-II pump and it's been great so far.</blockquote>