To ensure fire safety, fuel dispensing pumps and connecting fuel hoses must be properly grounded. This requirement is especially relevant for mobile filling stations.
Dispense pumps and fuel hoses, especially those made of plastic, can build up significant static electricity. This is facilitated by certain atmospheric conditions, as well as friction of the fuel in the flow path of the dispensing pump and in the hoses.
Pumps, hoses and ground fuel tanks of mobile gas stations must be grounded.