subman

I decided to double check the AFPR I re-installed on my 91 a couple of weeks ago.
A quick to date - I have been using 50motorsports 22# pink tops for about 3 years and I almost remember that they needed a bit more psi than the Multecs.
I recently had to go back to the GM FPR. That's about when the car failed smog. Hence the re-install of the AFPR.
I kinda remembered Bogus saying that the psi needed to be set with the vacuum disconnected and the line plugged. I did a search on CF and concensus is that's the way to do it.
With the vacuum disconnected, I initially had 42#. Took that to 40#'s and added the vacuum. The needle dropped to 30#'s even. Engine rpm dropped for about 12-13 seconds did a skip step and resumed a smooth idle again (the interval from pulling the plug to attaching the vacuum line seemed to be the cause). When I turned off the engine (30 or so minutes ago) the pressure was 38#'s. It is still at 38#. good thing is no leaks. so - o - o, is the 30# of fuel pressure correct? It just seems a drastic drop.
Awaiting some replys -
T.I.A.
Subman

jghmczo6

I have a similar problem,('90 vert) installed 24# Bosch to replace the Multitec injectors, also with a AFPR and gage attached to the schrader valve. The car ran rich , adjusted the AFPR regulator down, however I did not know to disconnect the vacuum line. Excuse the ignorance, which vacuum line did you disconnect? I assume the car was running when you did the adjustment? I am at about 38# also and I believe that is too high as I have a smog test this week. I am not trying to high-jack your thread, however I am quite curious aboout the responses you wil recieve.

Thanks

Aardwolf

You unplug the vacuum line on the regulator then turn the dial to set the pressure. You don't have to plug the vacuum line when setting the pressure. If I remember right, stock pressure is 44. When you plug the vacuum line back in, the pressure should drop, that is normal.

jghmczo6

Thanks will do this today

subman

If I remember right, stock pressure is 44. that is correct for 92 and newer (41# to 47#) 85 to 91 are 31# to 39#; 84's are 10#-13#. I only know this 'cause I had just finished reading it.
Subman

Aardwolf

The book I have is showing 41-47 for my '88.

jghmczo6

I did this Saturday and the car is not running rich 38# to 40# thanks Aardwolf

Good numbers to know thanks subman