What does prime mean on keurig coffee maker? - Keurig B50 Coffee Maker

Prime means.... pumping. In other words the water in the machine goes through a water pump. That pump, pumps the water from the fresh water container in your machine and pumps it up through the machine, then goes into a heating element that heats the water and then of course flows over the coffee or tea that you put in your machine to give you a nice cup of hot tea or coffee. Priming is in a sense getting the air out or allowing the water to start flowing. If you have a vapor lock or air lock, you need to prime it to kind of help this pump start pulling the water up to the coffee.

Hello, this is common. The pumps on these machines are not real good pressure. Sometimes you have to help it prime for the pump to work.
So one very good way to solve the problem is to turn the machine on and lift the water reservoir up just a couple of inches and then jam it back in place fast and hard. With this way is like it injects just enough pressure into the system to open the check valve and when the motor pump will run you will realize that immediately water will passing through from reservoir to brewer tank. This procedure has to be done often between cups.

From what we seen in internet their hundreds about the same problem but we have not see any serious response about it From Keurig's customer service yet.
One other important and related problem frequently reported is the irregulars doses of coffee like HALF-FILLED CUPS of coffee e.t.a

This must be redesign from Keuring factory since there is not much we can do about it to solve once for all even if they will replace your machine with a new one you will have the same problem in few weeks. And definitely this not a problem due your Electricity in your area or due to hard water. However hard water areas will face bigger and more intensive the above problem so one more suggestion is to descaling the machine every week this will help a lot.

If you find the above helpful please remember to vote for it Thanks Mike

After reading some of these tips I reached into the water tank with the bulb from the turkey baster and suctioned the filter and voila! I feel like McGyver!

I am crazed trying to make a cup of coffee in a vacation rental with an unfamiliar Keurig.. Added some water to the little opening as advised. Had to repeat the process to turn it off, reseat the water tank firmly a couple of times before the magic happened. Now I am at peace. Thank you everyone for saving my mind.

If you have an air compressor, crank down the pressure to about 20 psi, grab a tube of some type to cover the intake hole and inject air into the intake. A Tube? A short section of 1/2 inch pipe cpvc or copper, or a female air tool connector (Thats what I used)

You could probably also use a Turkey Baster Syringe, The thing with the Ball on the end.

Mine sometimes gets an air bubble in the water line. Instead of slamming down the water tank I remove the water tank, turn it off and turn it upside down. This dislodges the bubble and then I don't worry about harming the water tank. It's call the Keurig Burp.

Thanks so much Mike!
This is our second Keurig, and I almost cried when the first one finally slowed down then finally died an agonizing (for us) slow death. We immediately went out and purchased another Keurig, but we never had this problem (the "Prime") previously.
I truly appreciate your solution, and I hope that it works! Additionally, I too hope that Keurig will respond to its customers' issues with this product. A half cup of coffee early in the morning just isn't adequate!
Peg