Probably from G4078 (through the idea of gushing plumply); a fount (literally or {figuratively}) that {is} source or supply (of {water} {blood} {enjoyment}) (not necessarily the original spring): - {fountain} well.
A prolonged form of a primary verb (which in its simpler form occurs only as an alternate in certain tenses); to fix ({peg}) that {is} (specifically) to set up (a tent): - pitch.