Fp regulator mods

[Shannen Durphey]

Later gm cruise control diaphragm is maybe 2 1/2".  Like the type
found on (guessing)89/90 astro van.
Shannen

diy_efi at efi332.eng.ohio-state.edu wrote:
> 
> >might be easier to just vent the manifold side of the existing
> >one to atmosphere, and add a second, bigger one with
> >manifold pressure on one side and atm.
> 
> Greg,
> 
> I didn't pay this much attention at first, because it seemed
> beyond my capabilities.  Mostly because manufacturing a
> diaphram with the spring seat, etc would be impossible for
> me.  But the more I think about it, the more I like the idea.
> 
> Maybe I can find an existing larger diaphram from a larger
> regulator, or and EGR valve, or a A/C vent mechanism, or
> cruise control, etc.  (Any other ideas?)  I would need one with
> a diameter of ~2" to achieve the desired rising rate.
> 
> Connecting the new top to the old bottom will be tricky part.
> 
> After my post last night about adding a larger diameter pipe
> to the outlet side of the reg., it later occured to me that it may
> not work either since, once the diaphram lifts to relieve pressure,
> the entire underside of the diaphram will be exposed to the fuel
> pressure.
> 
> Anyone have a cheap milling lathe for sale? 8-)
> 
> Thanks,
> -Mike
> ==========================================
> Mike Pitts
> Delray Beach, FL
> mpitts at emi.net
> ==========================================