Dave Hill wrote:Hi Experimenteer (Ahhhgg I hate using Forum names )
I have noticed this "venting" of fuel pressure that you mention, but only on the Delphi common rail systems that we see on makes such as, Renault, Ford, Jaguar. (in the UK)
You will hear a double "high pitched buzz" at engine switch off, which sounds a little like a Bumble Bee trapped under the engine cover.
I have seen it on many waveforms, using a current clamp, to monitor injector events.
What part of the world are you in?
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