Fuel Regulator / VSV

[bart1989]

I am a little scared of starting a new thread after reading "how to ask smart questions". I do not want to be a "time-sink"...but my knowledge is weak in comparison to other members.
Well here it goes.
I have days into reading threads and manuals on MKIII fuel systems.
My car is a 1989 with 1992 ecu and engine. (converted from na to turbo)
A list of mods:
- walbaro fuel pump (running on 12 volt all the time)
- aeromotive fuel regulator (with installation package from Suprastore)
- 550 injectors
- drilled out "J" tube
- maft-pro running on speed density
- many others that are not related to my questions.
I know that I should adjust fuel pressure to about 38 with vacuum line off.
My problem is there is no difference in fuel psi with vacuum on or off.
Yes, I have tried this with the car worm.
I believe the VSV makes the regulator vacuum line common to atmosphere or common to inlet manifold pressure. When I take the vacuum line off the regulator and try to blow or suck on the disconnected line that goes to the VSV, it feels like the line is plugged.
Do I have a plugged vacuum line somewhere or is my VSV bad?
What would happen if I hooked up manifold pressure directly to the fuel regulator?
All thoughts and comments would be appreciated.

 

[JesseH]

I am running a straight vacuum to my AFPR from the FFIM with no VSV and Ive been ok with it, some people have said that you take chances with it being hard to start when its warm, but thats up to you if you want to take the chance......then again I havent even noticed a difference

 

[bart1989]

I live in Canada...we rarely see warm.
I may take the chance.
Thank you for the input

 

[jetjock]

The very fact you read that and the manuals rates an answer from me. That you don't write like a 10 year old is frosting on the cake. You even spelled "vacuum" right. (I'll overlook "worm")

You're correct in that the VSV switches the regulator between manifold and atmosphere with it connecting the regulator to atmosphere for appx 90 seconds after start up whenever coolant temp is below about 120 F. It sounds as if yours isn't working but as was mentioned you can connect directly to the manifold and likely not experience a hot start problem.

Edit: a look at your profile explains it...

 

[bart1989]

Thanks jetjock
We just got 14" of snow...I'll try plumbing direct to the manifold when the streets melt again. Like I said, we don't get to use that word "worm" often enough in Canada to learn how to spell it.

 

[Nick M]

If you need to get to the VSV, it easier to take the alternator off than the manifold.