Italian to English Tech/Engineering Engineering (general) filling of tanks with LPG

Same subject as before.
Load sumps???? Not many hits in google :(
Many thanks for your help, it really is very much appreciated!

a) tra i punti di riempimento e le pompe dell'impianto di distribuzione di GPL ed i pozzetti di carico dei serbatoi di combustibili liquidi (benzine e gasolio)

a) between the refilling points and the pumps of the LPG distribution installation and the xxx xxx of liquid fuel tanks (petrol and diesel)