pump can short cycle if pressure tank air space missing
drain pressure tank to put air space back in tank
at normal operations air space top up is made by air injector
small leak or air injector faulty can make air space loss
if pump not used for long time this can make air space loss
if fitting stainless steel tank important to test no leaks and air injector working ok
many worker do not understand operations of these pump with air space injector
number 19 is air injector