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Bubbles in fuel filter

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Old Oct 8, 2007 | 12:16 PM
  #1  
Kaukasion's Avatar
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From: springfield IL
Car: 84 z28
Engine: older 350, details unknown
Transmission: th350
Axle/Gears: factory limited slip
Re: Third fuel line

hey guys not to steal the topic but i disconnected the canister vac line from my edelbrock
and i have noticed when i shut the motor off small air bubbles coming up through my fuel filter ("see through one") and am wondering if that is going to hurt anything, also if you use a vented cap should you remove the trap flap from the fuel cap area? just wondering if that would help the pressure get out of the tank
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Old Oct 8, 2007 | 02:40 PM
  #2  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
This is a different topic, so I have moved it to it's own thread.

(TGO policy is to keep threads to the originator's topic.)

The bubbles are vaporizing fuel. Not exactly a desirable condition, can lead to hard starting after sitting hot.

The "trap flap", as you call it, is carryover from the days of leaded fuel. When unleaded fuels were required starting in 1975 in cars with catalytic converters, they put a "restrictor" in the fuel fill to keep a leaded gas nozzle from fitting in the tank, and that little flap to keep people from trying to just pour it into the filler. It has no effect whatsoever on tank venting.
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Old Oct 8, 2007 | 04:43 PM
  #3  
Kaukasion's Avatar
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From: springfield IL
Car: 84 z28
Engine: older 350, details unknown
Transmission: th350
Axle/Gears: factory limited slip
Re: Bubbles in fuel filter

thanks five 7

im learning alot reading around here
gave up on the pos trans am and just bought this crappy z for 500 and trying to get it running right
----------
oops forgot
so what type of vented cap should i get
do you have any recommendations

Last edited by Kaukasion; Oct 8, 2007 at 04:45 PM. Reason: Automerged Doublepost
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Old Oct 8, 2007 | 06:02 PM
  #4  
five7kid's Avatar
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25 Year Member
iTrader: (14)
 
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
My recommendation would be to keep the stock vapor canister and unvented fuel cap.
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