WS4 fuel pressure & flow

nissian primera 1992

There are no leaks. With the key on engine off the fuel pressure is 264kpa. On idle for a couple of minutes the fuel pressure is 260kpa. With the engine idling and then the fuel line is clamp the fuel pressure rises to 490kpa. When the vacuum line is disconnected and plugged on idle the fuel pressure rises to 310kpa. The rest fuel pressure was recorded at 250kpa after the engine is truned off and fuel pressure was watched for 5 minutes. The flow of fuel was 2.2l a minute.
After test equipment ws taken off and fuel lines hooked back up properly I check for leaks before it was turned on and after engine was running.
It is important to know a vehicle fuel pressure/flow to ensure that fuel is reaching the injectors and tat the right pressure so the car won't be running rich/lean.To much pressure could cause a hose to burst and to little could cause low combustion. Faulty fuel pressure regualtor could cause to much fuel pressure in the fuel rail and cause the car to use to much fuel and it won't be economical.