When oil is drawn up from the oil tank to the burner large amounts of gas bubbles can be released from the oil. These gas bubbles are released when there is a negative pressure (vacuum) in the suction line. This occurs in almost every installation, but above all when oil must be lifted to a higher level, drawn through long suction lines or when the suction line is too coarse for the needed oil flow. Air can also enter the suction line if all connections are not 100% tight or if the tank is run empty. The gas/air bubbles flow with the oil into the oil pump and are the leading cause of breakdowns, increased build-up of soot, unnecessary wear and tear on the oil pump and higher oil consumption. Using a Tiger Loop removes the air bubbles from the fuel being fed to the oil burner.