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Reply to "Fuel pressure ok?"

I've been interested in EFI conversions for the Cleveland (or Fontana) but I really know very little about the systems. In one of the books written by a company called "TPS" decades ago (1988), they mentioned fine-tuning their GM system by varying the fuel pressure. On a dyno, they ran from 40 psi on the low end to 55 psi and the throttle response & bhp varied considerably.  And that was with stock GM-style injectors. Do 8-hole throttle bodies change the rules on varying fuel pressure? 40 psi seems low based on what little I think I know.

That threaded stud (#3)  with locknut is how one changes fuel pressure on a regulator. If you remove the 4 small screws, that part of the housing comes off and there should be a rubber diaphragm underneath with a fairly weak coil spring. Possibly the old diaphragm has a small puncture maybe from using CA gas and that's why the thing doesn't hold fuel pressure when switching off.

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