fuel pressure/vacuum pressure
05-28-2008, 05:28 PM
#1
Junior Member
Thread Starter
Join Date: May 2008
Location: North Hollywood, CA
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: '89 IROC
Engine: 350 TPI 5.7L
Transmission: 700r4
Axle/Gears: axle?? got me.. 3.73:1 gears
fuel pressure/vacuum pressure
wondering what range my fuel pressure should be reading, with car off, and running.
also what is the best port to use to check my vacuum pressure, and where should that normally read.
'89 iroc 305TPI
also what is the best port to use to check my vacuum pressure, and where should that normally read.
'89 iroc 305TPI
05-28-2008, 11:06 PM
#2
Supreme Member
iTrader: (1)
Join Date: Aug 1999
Location: Rowlett, TX
Posts: 2,842
Likes: 0
Received 6 Likes
on
6 Posts
Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
Re: fuel pressure/vacuum pressure
Not sure about what the vacuum reading should be, but fuel pressure should be around 43PSI with the engine off and key forward, and around 38PSI with the engine running, at idle. As RPM goes up, it will gradually increase to 43PSI as vacuum decreases.
05-29-2008, 02:41 PM
#3
Senior Member
iTrader: (1)
Join Date: Jul 2007
Location: MA
Posts: 1,141
Likes: 0
Received 2 Likes
on
2 Posts
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: fuel pressure/vacuum pressure
Most any of the vacuum ports can be used. If it's TPI, the one back by the EGR on the passenger side is fine. It should be 18-20" at a warm idle
Thread
Thread Starter
Forum
Replies
Last Post
R3500
Engine/Drivetrain/Suspension Wanted
1
08-17-2015 12:16 PM
92camaroJoe
Tech / General Engine
6
08-13-2015 06:07 AM
