Woody, I am late to the thread and have read the other's postings which give good info. I am perplexed as to how your system can have good air flow out the exit( to the filter) and yet poor air flow on the vacuum side. As other have noted the most likely culprit is blockage or partial blockage of your ducting to the tool(s). Another possibility is that the impeller is not tightly attached to the motor shaft via the connector. If it allows the impeller to spin, but with a lot of slippage, you will see airflow, but not much pressure or suction since the impeller is not delivering the full capacity of the motor. If you pull the motor from the top of the cyclone, loosen the screws in the connector, and observe the motor shaft for evidence of the impeller spinning( wear marks or groves on motor shaft). If no evidence of spinning, replace and re-tighten connector ( see instruction s on Clearvue web site being careful not to over tighten and break the cap screws on the connector.