You should get air bubbles from the main drain for at least 30 seconds before closing the MD valve. Main drains require pressure more than air flow to blow them out. Shopvacs have great air flow but sometimes can't sustain pressure. If you have a compressor, you could try to hook that up to a drain opening on your pump and have only the MD valve open to try to blow it out with pressure. If you can post a picture of the bottom drain valve in it's current position, we might be able to help you better.
How do I post a pic? I clicked on the icon above but it doesn't give me a screen to upload it.
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