Originally Posted by TeKKiE 
Keep this in mind:
Your car is not always in vacuum. It is only in vacuum at idle. This is why with vacuum removed (under load), you should have ~43psi of fuel pressure, or 3bar. Same is said for 4bar fuel pressure. Under load (no vacuum), you should have ~58psi of fuel pressure.
That's why they say to check with vacuum removed and capped off. You need to know what fuel pressure is under normal load, not what it is at idle.
That's right, whenever talking about fuel pressure you need to to know whether whether the vacuum hose is connected, or disconnected and plugged, to avoid confusion like Jen experienced. His specs are correct when the hose is disconnected and plugged.
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