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Good evening folks.

Can anyone offer some guidance for repairing leaks in an S90 tank? Specifically, my aux tanks seem to leak around the sumps even after replacing. I didn't build the plane and unfortunately, there are no manuals and access ports for the tanks. Any advice is appreciated.

Is this a solid plug or is it like a SAF-AIR drain valve? If it's a drain valve it's probably just a o-ring issue. I think you can get a re-build kit for them or you might have to replace it. I'm not sure what size it might be.
If the leak is around a solid plug you might try some fuel lube on the plug.
If it's leaking around the AL block that's bonded in the tank that's a bigger issue. Fixable but more work.

Thanks Joe. We replaced the quick drain valve. All fixed.