Respuesta a "Dispenses less water than used to into drink"From what I can tell, our K40 is underfilling the coffee cups because the small air pump is wearing out. The air pump is what moves water from the boiler to the K-cup nozzle. When it starts to wear out you will get a full cup with no K-cup inserted (water only), but only a partial cup when you are trying to make coffee. The air pump is similar to ones used for fish tank (aquarium) pumps. You can find a number of them available at various prices on Amazon, and used ones on eBay. Note that the aquarium pumps lack the metal mounting flange needed for a Keurig, but you might be able to transfer the mounting flange from the existing one. Easier to buy a new pump which has the flange. Reviews on Amazon note that some of the aftermarket air pumps are not very durable. There are instructions on replacing the air pump on a K40 in an article at fixing the k dot com. Do an online search for “Keurig replacing the air pump” and you should find the article. The hard part is getting the side shell off of the top. The air...