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Hypertension (positive pressure) in the tank?

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banan1984
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Hypertension (positive pressure) in the tank?

Postby banan1984 » Mon Apr 23, 2012 12:06 pm

So guys question for ya, while opening the fuel cap does the sound is coming out on Your cars like pssssssssss ?? :lol I heard it doesn't supposed to.. Ventilation is probably blocked, anybody any thoughts or ideas how to "fix it", where to find it?
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antok
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Re: Hypertension (positive pressure) in the tank?

Postby antok » Mon Apr 23, 2012 1:41 pm

Now that you mention it mine does the same I've jus never actually taken any notice of it ha noting to worry about as far as I know thou :?: :?:

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wullie_trd
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Re: Hypertension (positive pressure) in the tank?

Postby wullie_trd » Mon Apr 23, 2012 2:28 pm

My tezza does it and my celica used to do it, I thought it was normal! Lol
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Soiled
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Re: Hypertension (positive pressure) in the tank?

Postby Soiled » Mon Apr 23, 2012 2:43 pm

It is normal.

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Damok
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Re: Hypertension (positive pressure) in the tank?

Postby Damok » Mon Apr 23, 2012 3:19 pm

My old Levin did it and the tezz. . :? I thought it was normal.
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banan1984
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Re: Hypertension (positive pressure) in the tank?

Postby banan1984 » Mon Apr 23, 2012 3:58 pm

I was told by few mechanics that in this class of car should be venting in the tank. I talk to my dad about it, he's driving bora 03 TDI and have the vent on fuel cap.. I wouldn't say thats the way it should be.
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G-TECroscommon
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Re: Hypertension (positive pressure) in the tank?

Postby G-TECroscommon » Mon Apr 23, 2012 4:19 pm

im the same, and its been the same in all of the altezzas iv had so far i doubt it would really matter would it?
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Damok
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Re: Hypertension (positive pressure) in the tank?

Postby Damok » Mon Apr 23, 2012 4:48 pm

The way I'd look at it is,, If a few people said their car didnt do It I'd worry but the fact everyone so far is in the same boat I'd say its just one of those things. :idea:
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mike_01
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Re: Hypertension (positive pressure) in the tank?

Postby mike_01 » Tue Apr 24, 2012 4:03 pm

wullie_trd wrote:My tezza does it and my celica used to do it, I thought it was normal! Lol



same here :lol:
did you get a tezza after the celica?

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BMcD
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Re: Hypertension (positive pressure) in the tank?

Postby BMcD » Tue Apr 24, 2012 4:31 pm

All my cars have done this....

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poTTa
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Re: Hypertension (positive pressure) in the tank?

Postby poTTa » Tue Apr 24, 2012 9:02 pm

There's no vent and it's a sealed tank. The only reason you get this suction (negative pressure) of air is because your fuel is too low which causes the fuel pump to pump air in the lines.

You shouldn't allow your fuel level to get pass the last quarter because of this and also there's always dirt and bits of stuff at the bottom of the tank.
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Soiled
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Re: Hypertension (positive pressure) in the tank?

Postby Soiled » Tue Apr 24, 2012 9:45 pm

No matter what level of fuel you have the fuel pick up is from the same spot so makes no difference for the dirt etc the fuel filter is there to deal with this.

As for pumping air I dont think thatd be too common as youd notice a big dip in power, funny noises or worst case melted pistons from running lean.

But in a sealed tank with petrol levels going down leaving more space for air to occupy would cause it to be less dense thus a low pressure area is made, opening the cap allows it to equalise.

Only cars Ive had that didnt make this noise were carbied, which a couple sucked air if the fuel tank was low due to the lack of baffling. Made some horrible noises at times!

All this is just opinion though and could be completely wrong haha.

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wullie_trd
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Re: Hypertension (positive pressure) in the tank?

Postby wullie_trd » Tue Apr 24, 2012 10:54 pm

mike_01 wrote:
wullie_trd wrote:My tezza does it and my celica used to do it, I thought it was normal! Lol



same here :lol:
did you get a tezza after the celica?



Yeh man Had Celica VVTL-i Import in white before .... loved it but ...... circumstances changed and needed 4 door.
Oh how i miss this car!

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poTTa
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Re: Hypertension (positive pressure) in the tank?

Postby poTTa » Wed Apr 25, 2012 12:06 am

thats a sexy looking celica there guy..... :D
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mike_01
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Re: Hypertension (positive pressure) in the tank?

Postby mike_01 » Wed Apr 25, 2012 10:33 am

sweet, I don't really miss mine much though but strange how most who have a celica end up with a tezz, I know at least 5 now 6 you :lol:


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