Is your well bottom rock, sand or mud?
You know when you walk in the mud and the mud sucks your boot off?
A pump and pipe can get stuck in mud or sand and create a vacuum.
When your pulling your pipe and it pulls hard you need to stop for awhile and let the succun release before continuing your pull this can take anywhere from 30 mins. to hours depending on the density of the mud or sand, we been told as much as a week has passed before the pump broke lose. mark you pull line and walk away when you see the mark move put more tension on the line.