Abstract: A fuel system damper includes a damper diaphragm, a damper spring, a vacuum bias diaphragm, and a vacuum bias spring. The damper spring is biased between the damper diaphragm and the vacuum bias diaphragm, and the vacuum bias spring is biased against the vacuum bias diaphragm in the top chamber of the damper. A bottom chamber below the damper diaphragm is open to allow fuel from the fuel rail into the chamber so that the damper diaphragm can respond to pressure pulsations in the fuel. The top chamber has an opening that communicates with an engine intake manifold so that when engine intake manifold pressure decreases to very low levels, the vacuum bias diaphragm will travel up. This upward motion reduces the pressure in the fuel rail by removing load from the damper spring. When the pressure regulation setpoint is reached, the regulator will supply fuel to maintain pressure.

Abstract: An apparatus identifying a class of called telephone lines by extending an identity signal back over the called line to a calling central operator or control. The identifier apparatus includes a signal identity generator connected to the called line, a signal decoder located at a calling central control such as an operator cordboard or traffic service position (TSPS), and a time-out for deactivating the generator after a predetermined time period has elapsed. A method is also set forth where a uniquely coded signal is extended over the communication line to an operator when an "OFF HOOK" condition appears from the called line to warn the operator that the called line is not authorized to receive collect calls.