Are you sure about that spec?
Here is what Alldata says.
Fuel Pressure, Engine Running
The pressure should rise to approximately 309 kPa (45 psi) immediately after the engine starts.
Fuel Pressure, Residual
The fuel pressure must not be lower than 200 kPa for 20 minutes after the engine is shut off.
Saturday, September 3rd, 2011 AT 4:32 PM