Chosen Solution
I use my Keurig B40 with K Cups and plastic refillables. Both have the same problem. Yesterday, I noticed that water was flowing into my coffee cup along with the coffee. This makes for a rather weak cup of coffee . I thought that there was a leak where the top needle punctures the K Cup. I removed the rubber seal aroung the needle. I cleaned the seal and the surface around it. There was a lot of old coffee around the needle. I reassembled the seal and made a new cup of coffee. The same thing happened. When the brewing was complete, I removed the K Cup. The top was dry. I found the same thing with the plastic reusable. Water is bypassing somewhere, but the top is dry. What should I do next? I found the problem after taking the top cover off the Keurig B40. The hose to the water injector had pulled loose and thus most of the water was bypassing the K Cup. I put it back together and the problem is fixed for $0.
Remove the top cover. There are 2 screws at the front under the cover. Then check the hoses.
This problem happens eventually to 90% of Keurig (and other) machines when brewing reusable K-Cups like My K-Cup. There is an easy fix for this available on ebay for $4.95 that works like a charm. It’s a new part to add in the lid of your brewer in seconds without tools and is guaranteed to fix this problem instantly or your money back - including return postage. Click this link: https://www.ebay.com/itm/171557357690
