This is in line with the hole in the center of the coffee bed you are describing. If the grind is too coarse, the water is just running through the coffee and doesn't leave the time to spread and steep. The problem may be what was suggested in the comments. Try a finer grind, something between table salt and sand (probably just the medium-fine setting on your grinder, however do check with your fingers). If it is not the quantity of coffee it is probably the grinder setting. If the roast is very light you may use a slightly higher coffee to water ratio. Try using 6g of coffee per 100ml of water for a medium roast. Watery coffee most often means that you don't use enough ground coffee. Well this is a strange problem but it seems to have to do with the new grinder you are using or the way you use it since the grind is the only variable that has changed (according to your story). I keep the beans in the closed hopper of the grinder. Is it the beans? I do switch around, but the beans I buy are in the 10-20$ range per pound. Is my coffee maker broken? I tried cleaning with diluted vinegar, but this did not change things. It's as if the hot water is going directly through the filter without soaking enough in the grounds. When I inspect the coffee filter and the grounds after brewing with the 6-cup grind, I observe a portion of the coffee grounds appear dry on top, although beneath that, the coffee grounds appear wet. I have set the coarseness of the grind to medium, which I believe is appropriate. With all that said, what has happened for the past week is that coffee made using my brewer has been tasting watery, no matter if I use the 4-cup or the 6-cup grind setting, and whether I try more or less water. I found that the 6-cup setting tasted pretty good, but seemed to use up a lot of beans. I usually brew using 16 to 20 fluid oz of water, and I have switched between the 4-cup and the 6-cup setting on the grinder.

My coffee did not become watery upon first use of the DBM-8. This grinder has allows for a grind amounts in increments of '2 coffee cups' starting from 4 cups. I recently purchased of a Cuisinart DBM-8 (a basic automatic grinder) to replace an even more basic blade grinder. Coffee 5-cup drip brewer has been watery tasting, and I am hoping for some troubleshooting help.

Bunn coffee maker grounds spillover