Firebird V8-305 5.0L VIN F FI (1987)
pressure drop occurs only while driving,the engine will normally surge then stop running as pressure begins to drop rapidly. This is most likely
caused by a restricted fuel line or plugged filter.
6.
Restricting the 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 414 kPa (60 psi ).
7.
This test determines if the high fuel pressure is due to a restricted fuel return line or a pressure regulator problem.
