The feeding pipe has {HEAD ~ at least one zone} that is situated at {TAIL ~ a lower level} than the tank level and that is provided with two conduits 30 and 32 arranged parallel, and a second pump 34 arranged on one of the two conduits 30 as to automatically un primed the first pump 24 
The feeding pipe has { HEAD ~ at least one zone } that is situated at { TAIL ~ a lower level } than the tank level and that is provided with two conduits 30 and 32 arranged parallel , and a second pump 34 arranged on one of the two conduits 30 as to automatically un primed the first pump 24
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH