Re: Fuel pressure at the injectors?

["dherv10" <dherv10@xxxx>]

Eric, Inside the fuel distributor is a barrell that the control 
plunger goes up and down in. The metering slits are .2mm opening. 
When the plunger goes up and if there is any obstruction at the slit 
area, then gas won't flow through correctly. Thats why I said, Put 
some B12 in the gas and go drive it out and then come back and check 
it again. Go back to the injectors that that weren't blowing right at 
the beginning and see if it's changed. If not and the pressure is 
correct and the injector swaping didn't show a bad injector. Then I 
can rebuild the Fuel dist.Be carefull soaking in B12. It's good for 
cleaning, but if you soak to long the o rings could swell. There 
could also be a small break in the SS diaphram that seperates the 
lower chamber from the upper chamber. 
John hervey
http://www.specialtauto.com/images/fuelsystem.jpg
John hervey
--- In dmcnews@xxxx, "deloreanfl" <ericp@xxxx> wrote:
> Just when I was getting comfortable with my understanding of the CFI
> system on my D, I've confused myself.
> 
> Could somebody please set me straight with what "portion" of the 
Fuel 
> injection system actually limits (or controls) the fuel pressure 
> specifically at the injectors?
> 
> I realize the injectors are mechanical, and open at about 3-3.5 BAR.
> I also understand the fuel distributor sends the fuel to the 
> injectors, and that there is a System Pressure regulator inside the 
> distributor.
> 
> I dug out my trusty gauge, measured the system pressure, control 
> pressure (CPR)...etc. Compared them to the shop manual (all being 
> within specs). But I cannot figure out why, with minimal air-plate 
> deflection, not all of the injectors fire...but deflecting the 
plate 
> further they all fire equally. 
> 
> Bad Injectors? Faulty Fuel Dist.?
> 
> BTW: all tests were done with the RPM relay bypassed, obviously all 
> injectors removed.
> 
> Thanks
> Eric
> Dunedin, FL
> VIN# 5557
> ericp@xxxx