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tjyak50
 Post subject: Fuel tank pressure
PostPosted: Tue Aug 23, 2011 7:31 pm 
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Joined: Wed May 25, 2011 9:27 am
Posts: 56
Location: Phoenix, AZ
Its hot in Arizona.

When I open the fuel tank cap there is a MAJOR release or pressure.
Normal?

It can even register a few residul PSI on the fuel pressure gauge at the regulator.

Tj

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PhrogZ46
 Post subject:
PostPosted: Tue Aug 23, 2011 8:58 pm 
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Joined: Thu May 28, 2009 3:44 pm
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Location: Massive Sangwich
Normal.

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Frank T
 Post subject:
PostPosted: Tue Aug 23, 2011 11:27 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 14781
Location: CT
Normal. Almost all of them do that.

In my UNVENTED 1970 240Z, it's actually a vacuum. If I wait too long to open the cap (drive the tank too low) it can actually make it difficult to open the cap.

I have developed the habit of opening and closing the cap periodically, regardless of the fuel level. Some models had vented gas caps ~ mine doesn't. Most have "kidney tanks" hidden under the panel behind the passenger seat. Mine doesn't.

Phil has an interesting story about this. 8)

Frank

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tjyak50
 Post subject:
PostPosted: Wed Aug 24, 2011 12:23 am 
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Joined: Wed May 25, 2011 9:27 am
Posts: 56
Location: Phoenix, AZ
My 1973 240 has "another tank" in the cabin behind the right rear shock.
Not sure what that is. Shaped like a kidney I suppose.

It also has a factory electric fuel pump.
At least I think it is factory?

I filled the car very full Monday and opened the cap today after driving all of 5 miles and it barfed up about a quart of fuel on my hand... I think I should punish it for this?

I have been leaving the cap partially loose ever since.

Tomorrow is supposed to be 116f+.
Stupid hot. How can anythying be expected to run properly?

My Nissan truck does ok. and my 1988 560SeC does surprisingly well with some mods.

Tj

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Frank T
 Post subject:
PostPosted: Wed Aug 24, 2011 12:36 am 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 14781
Location: CT
Yeah, that's the one. That "other" tank behind the passenger seat shock tower is supposed to balance pressure and capture vapors. It has about 6 hoses running to it, from the tank top and the engine bay. It might be made of plastic or metal.

Unused fuel returns to the tank from the engine, causing vapors inside the cabin. (Not to be confused with exhaust fumes being sucked into the cabin past leaky hatch gaskets or tail lamps). That 'kidney tank' is supposed to prevent that, or reduce it. I have never been able to follow all the hoses attached to it, and they changed over the years. If you get one of them plugged up it can cause fuel tanks to collapse, or fuel to surge out of the filler, or caps to refuse to turn without a wrench.

Most cars get a WHOOSH of pressure released when the cap is open. I get a WHOOSH of vacuum equaliZing when I open mine.

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phil280zxt
 Post subject:
PostPosted: Wed Aug 24, 2011 7:38 am 
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Joined: Mon May 19, 2008 8:17 pm
Posts: 2148
Location: Colchester, Ct
Yes Frank, gas tanks and vacuum are not popular subjects of mine!!

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1981 280zxt - Now in the care my son!
2014 370Z Sports Touring Roadster
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Frank T
 Post subject:
PostPosted: Wed Aug 24, 2011 7:59 am 
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Joined: Wed Apr 09, 2008 5:53 pm
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Location: CT
:lol: I remember.

Can you find that thread and link it here, so TJ can enjoy your misery and suspense?

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theZman
 Post subject:
PostPosted: Wed Aug 24, 2011 8:00 am 
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Joined: Mon Sep 21, 2009 3:55 pm
Posts: 3594
Location: Naugatuck CT
phil280zxt wrote:
Yes Frank, gas tanks and vacuum are not popular subjects of mine!!


i remember that Phil.

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Mike Tubiak
1978 Datsun 280Z - HLS30-438694
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phil280zxt
 Post subject:
PostPosted: Wed Aug 24, 2011 8:06 am 
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Joined: Mon May 19, 2008 8:17 pm
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Location: Colchester, Ct
Here you go!!

http://forums.ctzcc.com/viewtopic.php?t ... nk&start=0

.... and here...

http://forums.ctzcc.com/viewtopic.php?t ... t=gas+tank

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Phil
1981 280zxt - Now in the care my son!
2014 370Z Sports Touring Roadster
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theZman
 Post subject:
PostPosted: Wed Aug 24, 2011 8:29 am 
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Joined: Mon Sep 21, 2009 3:55 pm
Posts: 3594
Location: Naugatuck CT
yeah Phil you learned vacuum sucks... :lol: :lol:

****DING DING DING DING!!!*****

Congratulations, Z Man! You just entered this Club's 29,000th Post! See my entry under WHAT's NEW for details! :D Frank

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Mike Tubiak
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