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Old 06-15-2009, 12:32 PM #1
indika indika is offline
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High pressure in gas tank
When ever I remove the gas cap to fill, it makes a big wooshing noise. Is it my Gas cap that supposed to release the pressure from the tank? Is this normal?

truck is a 94 4runner V6 SR.

Thanks in advance.

Indika
Last edited by indika; 06-15-2009 at 02:24 PM.
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Old 06-15-2009, 05:35 PM #2
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Re: High pressure in gas tank
Quote:
Originally posted by indika
When ever I remove the gas cap to fill, it makes a big wooshing noise. Is it my Gas cap that supposed to release the pressure from the tank? Is this normal?

truck is a 94 4runner V6 SR.

Thanks in advance.

Indika
All fuel systems have been sealed for a long time now to comply with evaporative emissions requirements. As a result, pressure equalization often happens when the system is opened.
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2000 Tacoma 4x4 V-6 SR5 Ext. Cab TRD Sunfire Red Pearl. (R.I.P)
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Old 06-16-2009, 09:12 PM #3
indika indika is offline
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Re: Re: High pressure in gas tank
Quote:
Originally posted by Annoyed
All fuel systems have been sealed for a long time now to comply with evaporative emissions requirements. As a result, pressure equalization often happens when the system is opened.
Thanks for the reply.

So it is normal? I have read conflicting info. So what is the pressure release valve supposed to do.

Haynes (for 4Ru. 79 - 95) have no mention of a pressure release valve do I have one?

I'm worried that it is drinking more gas than it should, because of the pressure in the tank. sorry cant do a millage test, I'm pretty broke for now.

Thanks again.
Last edited by indika; 06-16-2009 at 09:15 PM.
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