Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
Restricted flow causing pressure drop; Normally, a vehicle with a fuel pressure of less than 165 kPa (24 psi) at idle will not be driveable.
However, if the pressure drop occurs only while driving, the engine will normally surge then stop as pressure begins to drop rapidly.
6.
Restricting the fuel return line allows the fuel pump to develop its maximum pressure (dead head pressure). When battery voltage is applied to the
pump test terminal, pressure should be above 517 kPa (75 psi).
7.
This test determines if the high fuel pressure is due to a restricted fuel return line or a pressure regulator problem.