On 1/22/05 9:10 AM, "Ed Anderson" <eanderson@carolina.rr.com> wrote:

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

Hi Ed, I just came from the hangar. My FP is set at 37psi without the engine running. I noticed at 2300 rpm the FP was around 20 psi. So it varies with the MP.
Bulent