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I was reading Ash's 6 p's just now, this paragraph is confusing to me..."In the VG30, as well as most other fuel injected vehicles, have an operating fuel pressure of ~3bar. 1bar = 14.5psi so 3bar is effectively ~43.5psi. Since the tip of the injectors is inside of the manifold, this means that the vacuum or pressure that the injector tip 'feels' affects the fuel delivery. The ECU controls the duration of time that the injector is held open and it assumes that a given opening time of the fuel injector will always deliver the same amount of fuel. In order for this to work, there must always be a 43.5psi difference between the fuel rail pressure and the manifold pressure. This is to ensure that no matter what vacuum/pressure the manifold is under, a 'x' millisecond pulse of the injector will always deliver the same amount of fuel." If I understand this, then my 38psi at idle is really 48?? It goes from 38 to 50 erratic. Not a steady increase. I am aware of the fuel pressure reg but fuel controller? To properly test the pump, I need to do a leak down test?
Where I check gallons per minute....is that right?
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