writes:

It may be worthwhile to check how the pressure regulation gets feedback
on the engine load. Many cars, for instance, have a vacuum hose from
manifold vacuum to the fuel pressure regulator.

That's because the fuel pressure is regulated to be X psi above the
intake manifold pressure, not above atmosphere.

[I also have NoKlue if that's true on aircraft; whose FI systems
seemingly date from the Neolithic era of combustion history...]
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