Boost controlled fuel pressure regulator, does it work?

[tomant]

KE-Jetronic (CIS-E) has a fuel pressure regulator with a compensation for intake manifold pressure. At cruising (vacuum = low pressure) the system pressure is lower and at full load the pressure is higher accordingly. This should work with boost also: the system pressure should add the boost pressure to the original spring controlled regulator pressure. The higher system pressure should give a higher flow to the injectors and a richer mixture. Has anybody experienced or measured this kind of a mixture richening effect on boosted KE-Jet systems?

tomant