Fuel Tank Pressure
Thread Starter
Pro
Joined: Dec 2000
Posts: 513
Likes: 30
From: Tonawanda, NY USA
Fuel Tank Pressure
Is it normal for their to be excessive pressure in the gas tank? I went thru the whole test procedure in the tech manual and every thing showed ok (all valves, canister, and solenoid). I have to unscrew the cap slowly, and hear a wooosh sound for about 15 seconds or so (can hear the tank flex sometimes). Seems worse as the fuel leverl gets lower. Is this normal? or am I a paranoid individual?
:confused:
:confused:
Race Director
Joined: Jul 2001
Posts: 13,710
Likes: 0
From: So Cal
Re: Fuel Tank Pressure (Ezgoin721)
Same here, especially if my tank is almost empty and it is hot outside. I don't worry because this has happened to me on other cars that I have owned. :cheers:
Race Director
Joined: Aug 2000
Posts: 15,266
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From: Mountain View California
Cruise-In II Veteran
Re: Fuel Tank Pressure (morphious)
Must be normal then.. Mine does it too!
BTW.. Never unscrew the cap if you have a puddle of water around the cap, it'll suck it right in... :crazy:
BTW.. Never unscrew the cap if you have a puddle of water around the cap, it'll suck it right in... :crazy:
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Re: Fuel Tank Pressure (Vette_Crazy)
Can you blow through the line to the tank from the canister ?
I found some of the steel sectionsunder the car were full of rust and since replacing them I don't get such a pressure build up as I used to.
Some pressure will build up as the tank empties because there is more space for the hot fuel being returned from the engine to vaporize and less cold fuel in the tank to cool it down.
I found some of the steel sectionsunder the car were full of rust and since replacing them I don't get such a pressure build up as I used to.
Some pressure will build up as the tank empties because there is more space for the hot fuel being returned from the engine to vaporize and less cold fuel in the tank to cool it down.
Race Director
Joined: Jan 2000
Posts: 16,872
Likes: 4
From: Owings Mills, MD 21117
Re: Fuel Tank Pressure (Vette_Crazy)
I have to unscrew the cap slowly, and hear a wooosh sound for about 15 seconds or so (can hear the tank flex sometimes). Seems worse as the fuel leverl gets lower. Is this normal? or am I a paranoid individual?
:confused:
:confused:
Mark :seeya
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Burning Brakes
Joined: Sep 2001
Posts: 1,011
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From: Jupiter Florida
Re: Fuel Tank Pressure (GRX)
I may be wrong but I think its vacuum not pressure.
Pro
Joined: Jul 1999
Posts: 741
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From: Eagle IDAHO
Cruise-In I Veteran
Cruise-In II Veteran
Fuel Tank Pressure - Not Normal
It is Not Normal!!!!!
You have a rusted closed fuel vapor line that runs beside the gas line from the tank to the vapor recovery tank up by the left headlight tub.
Run a search on "Tank Pressure"
Mine has been fixed, and I get only an occasional slight hiss when removing the gas cap.
Took me 6 hours to remove the line, rod out the rust particles and put it all back together.
[Modified by NHVett, 9:39 PM 6/2/2002]
You have a rusted closed fuel vapor line that runs beside the gas line from the tank to the vapor recovery tank up by the left headlight tub.
Run a search on "Tank Pressure"
Mine has been fixed, and I get only an occasional slight hiss when removing the gas cap.
Took me 6 hours to remove the line, rod out the rust particles and put it all back together.
[Modified by NHVett, 9:39 PM 6/2/2002]
