Jplum

Ive got a 1988 chevy c3500 with the 350 tbi anyone know what the proper fuel pressure should be?

Pro

12
also go here
http://www.pacificp.com/forum/index.php
http://www.gmt400.com/

Tuned Performance

iTrader: (92)

12-14
From your other thread

Pro

I've got a video somewhere where I was starting up and driving around my truck on 7 psi, barely.

Schurkey

I thought 9--13 psi was the GM spec.

Jplum

12 is what a 350 tbi is supposed to run

Schurkey

I jacked-up my '88 K1500 from 10 to 11.5 psi with no apparent change in driveability.

Fast355

iTrader: (2)

Stock GM regulator on the 1992 G20 Van I pulled the 350 out back in the day was running 14 psi. Have found the as installed pressure anywhere between 9.5 ps and 15 psi. In my experience the ones that were in the 13-14 psi range with a STOCK engine ran best.

Pro

I bet what happened is someone in the past did a TB rebuild and used the POS regulator spring that comes from the parts store instead of the factory one. Parts store = flingy and loose, Delco = strong and stiff