Lots of vacuum preasure in gas tank, Why is this?? do I need new charcoal filter?
Supreme Member
Joined: Dec 2003
Posts: 2,391
Likes: 1
From: Newark, DE
Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00
Probably. Sounds like the tank can't vent, so that would be a good place to start.
TGO Supporter
Joined: Sep 2003
Posts: 6,127
Likes: 12
From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
There is another plastic vent coming off the fuel tank and is located on the car frame near the left rear tire. Also, are you using a vented or non-vented gas cap?
Member
Joined: Aug 2003
Posts: 311
Likes: 0
From: las vegas
Car: '92 droptop bird
Engine: 5.7L,mild cam etc.
Transmission: modded 700r4 w/2600
i had this prob. once and i replaced the white purge valve on the drivers underside frame and i also disconnected the return line as well as the vent line undercar and hood and blew compressed air through them both the prob. was gone....
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