I bought a new home and the builder had installed a 20 gal pressure tank. I have a jet pump system where the motor sits directly on the tank itself. I really notice the pump running a bit,but also notice the loss of pressure quickly, especially in the shower.
Now I was thinking of buying a much bigger tank, maybe 40-50 or even an 86 gallon tank. Will this help my problem... or will just adjusting my cut in/out pressure on the tank work..
Oh by the way.. I live with my wife, 3kids and My dang mother-in-law with her teenager is staying with us.. so total 7 people in the home.

Installing a larger pressure tank will give you more volume to play with. Increasiung the pressure won't give you more volume, just more pressure and you'll run out of volume sooner. My condolences about the mother -in-law and the baggage she brought along when she moved in. Being single I don't have those problems. (just kidding) On a happier note I wish you and your family a happy and joyous thanksgiving. Tom

BTW.. thanks for the condolences... ill need them

As for the tank.. is there a size I should be looking for, Or is the bigger the better with all these people? I keep reading all these post about raising the pressure with the switch. I guess ithis was my case Id have more pressure, but the pump will run more often?
I guess I want to make sure if I get this bigger tank, will I have the pressure the shower when I need it... Or will I still ,at that point, have to raise it up some to like a 40/60 deal.
What I want is more shower pressure and total pressure... Is it because I only have a 20gal holing tank causing the pressure to drop fast.. thus making the pump run often?
Will having a 55 gal holding tank keep the pressure up for a while before dying down and needing the pump to come on?

Ya got to unnerstand about pressure and volume. Ya got to have both. If you have a 20/40 pressure switch you have the pressure. Increasing it will give you a faster flow but it won't give you more water,(volume). You need to store more water, (volume) for that pressure to push the water out your pipes.
Here's a Rundown on Average Water Usage

Bath= 30-40 gals.
Shower= 5 gals. Per minute
Washer= 20-30 gals.
Toilet=1.6-- -3 1/2 gals per flush
Lawn watering= 10 gal per minute
multiply that times seven and you're going to need all the volume a tank will hold.
I only hope your water is large enough to carry the load. Good luck, Tom

Well pump

Is that a question?