fuel pressure/vacuum pressure
Thread Starter
Junior Member
Joined: May 2008
Posts: 56
Likes: 0
From: North Hollywood, CA
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
Supreme Member
iTrader: (1)
Joined: Aug 1999
Posts: 2,842
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From: Rowlett, TX
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.
Senior Member
iTrader: (1)
Joined: Jul 2007
Posts: 1,141
Likes: 2
From: MA
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
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