Yes, the [gauge] pressure measured at the fuel rail should vary with
manifold pressure. Things will still work if this doesn't happen but the
EC2 may run out of range in Mode 1 or 9 and it definitely makes tuning
the EC2 much more difficult if the regulator isn't responding to manifold
pressure changes. This is especially true at the low end of MAP
range.
Tracy
You certainly could be right about that,
Rusty. My understanding was to expect the fuel pressure to vary to
compensate for the different manifold pressure. But, there is no
indication on my gauge and this is the second pressure regulator (but, of
the same make Hmmm) that I have had. It does regulate (else my fuel
pressure would be much higher) but apparently does not compensate for
manifold pressure based on what I am hearing.
But, as you indicated, If there is any
operational problem associated with it, I have not encountered it (or
recognized it as such). It is one of the smaller ones and it could be
that it is dumping all the fuel it can at 40-43 psi and there is not
sufficient return flow capacity to compensate for the variations in manifold
pressure. I suspect that if I had a turbo where the manifold pressure
varied considerably that the lack of such compensation might be more
detrimental to engine performance (and life). Just speculation
of course.
Ed A