Non-linear fuel pressure reg - #2

[Clive Apps Techno-Logicals 416 510 0020]

> But then it occured to me, the diaphram surface area on which 
> the fuel presses against, and the surface area of the vacuum 
> side of the diaphram is equal.  So the vacuum is probably just 
> acting as a delta to the fuel pressure only, not the spring, and 
> the spring is probably just setting the base pressure.  In other 
> words, a faster rate spring will simply compress more from the 
> fuel pressure alone, then the delta created by vacuum will remain 
> the same.  So I guess there's a good chance that using a spring 
> of a different rate won't make any difference.

consider the vacuum to be a 2nd spring
the 1st spring is a constant source 
the vacuum is a variable source
a diff rate spring will make a change in the variable generated
the base height of the spring sets the initial pressure

Clive