UL Field Inspections. Yesterday we were greeted at the front door by our UL Inspector for an unannounced field inspectionâ¦surprise! At another facility there might be a cry for alarm, but at Coast Label Company there was no mad scramble, no rush to hide this, or go find that. We just sat him down and asked what he was checking today.
Jet pumps create suction in a rather novel way. The pump is powered by an electric motor that drives an impeller, or centrifugal pump. The impeller moves water, called drive water, from the well through a narrow orifice, or jet, mounted in the housing in front of the impeller.
How Fuel Pumps Work. 1  Step by step explanation on how an automotive fuel pump works. - 2  A connector is located near the top of the fuel tank, which is used to supply power and ground for the fuel pump and sensing wires of the fuel level sender. 3  Step 3 - A corrugated fuel tube is used to connect the pump to the top of the tank through the cap plate.