10-20 pounds would barely flow! Unless your perceived pressure is almost non-existant, then your gauge may be bad, or the pipe/fittings to it are clogged. You can buy a guage that screws onto a hose bib and double-check. If your pressure tank is shot (it is full of water) or it doesn't have the proper pressure in it, then that could also create problems. My unprofessional opinion.