No water

Hello yall, Im new to the well system and how it works so bare with me. I have no water pressure and I have no idea what may be causing this. I thought it was the pressure switch so I replaced it but the problem continues. If i connect the pump directly to the breaker it will pump water all day but as soon as i connect the pressure switch I run out of water. When I switch the breaker off and on I get water for about 10-15 minutes and loose pressure again. I would really apreciate any help. Thanks.