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 a mechanical (that's what is in most of our collector cars) fuel pump works is deceptively simple. It consists of a rubber diaphragm that is sandwiched between two halves of the housing and actuated by some sort of arm. More about that later, but for now we must distinguish between pusher and puller pumps.