McFarlane Aviation Products FAA-PMA Replacement Aircraft Parts

Vacuum Pumps

I frequently need to replace my Dry Air Pump. What could be causing this?
Is an overhauled Dry Air Pump as good as a new pump?
Should I use a cooling shroud on my dry air pump?
What procedures should be taken when replacing a failed pump?
When I start my engine the vacuum gauge reads zero vacuum, but as the engine RPM increases, the gauge will indicate vacuum. What causes this?

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