Quote:
Originally Posted by Ultramaroon
Disconnect and plug the vacuum to the pressure regulator. See if it changes how it idles. If Tcoat's theory holds, high manifold vacuum at idle increases return flow above the pump's ability to maintain pressure. It makes sense. Best thing would be to actually measure rail pressure.
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So, let's pretend I don't know what vaccum to what regulator you are talking about (it's the internet therefore I really know everything right?
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Are you saying that the fuel pressure regulator is controlled by some air vaccum line to the manifold? Not familiar with how fueling systems work so sorry if I misunderstood.
Assuming that is true, if I disconnect the regulator from the line, I need to plug the end of the line to maintain correct manifold pressure, and leave the regulator open to the atmosphere to see what that does to idle. What would you expect it to do if Tcoat is correct, versus some other problem?
Also, is it safe to start and run the engine this way? I would think there is a reason they need the fuel pressure regulator in the first place?