Q:
A: Fuel Pressure Pressure 1 (PSI) 46 - 52 Y491 Pressure 2 (PSI) 54 - 61 Y492 Pressure 3 (PSI) 36 Y493 Y491: Fuel Pressure (PSI) W/ vacuum to fuel pressure regulator. Y492: Fuel pressure (PSI) W/O vacuum to fuel pressure regulator. Y493: Residual system pressure (PSI). Fuel pump pressure after 30 minutes, engine off.
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