To find the correct fuel pressure, you must consult your vehicle's repair manual or a reliable online resource specific to your Vibe's engine (e.g., a Haynes or Chilton manual, or a reputable automotive repair website that allows you to select the year, make, model, and engine). The specification will be listed in PSI (pounds per square inch).
Attempting to diagnose fuel pressure issues without this information is risky and could lead to further damage. Improper fuel pressure can harm the engine.