Newly-filled Propane Tanks empty in four days-not used much

Old Biscuit, thanks for the info and the drawing. Now I am also told that propane tanks have an expiration date stamped on them. Further low temperature outdoors can diminish the efficiency of a propane system. Anytime a propane tanks’ pressure exceeds 350PSI the pressure relief will begin releasing propane vapor. So smelling propane may not necessarily mean that you have a leak. Can anyone verify these statements to be true or false? Thanks!!!!