Editing Forums/Z31P/z31-repairs-forums engine-mechanical/Gas tank pressure

{{ForumImport
|op_user=datsunzcar84
|op_date=2007-03-26 22:16:48
|post_count=11
|archive_url=/Z31performance_archive/forum/z31-repairs-forums/engine-mechanical/1952-gas-tank-pressure.html
}}

'''datsunzcar84:''' <small>(2007-03-26 22:16:48)</small>

It seems here lately that the gas tank has been building some serious pressure… I went to get gas today and, in removing my gas cap there was so much pressure that gas came rushing out .. I tried a new gas cap but that didn't seem any better .... Any one have any idea what might cause this ????

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'''Az4u2c:''' <small>(2007-03-26 22:50:48)</small>

Uh oh. Now i'm scared. My cap always lets loose of a big long sighing hiss when i take it off on a hot day or after a long drive.

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'''datsunzcar84:''' <small>(2007-03-26 22:55:20)</small>

Yes it caught me off gaurd.... It has been like this since i got it and it is has been getting worse.... The gas shot out like two and a half foot… scared the hell out of me.... :shock:

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'''G-E:''' <small>(2007-03-27 01:45:36)</small>

your vent line is plugged?

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'''MrwassmanNA2T:''' <small>(2007-03-27 02:44:12)</small>

Do you remove it slowly? That is a crap load of pressure. Definetly check your evac. stuff

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'''OR-Zman:''' <small>(2007-03-28 03:05:28)</small>

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That would be my first guess.

HP air can do wonders. :wink:

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'''88sinZ:''' <small>(2007-03-28 04:46:01)</small>

If you have this problem and eleminated most of your emissions crap, hook up a one way fuel filter to the evaporation lines. Mount it in a position distanced above the fuel tank to avoid spilling gas while cornering hard.

Pressure inside the tank will be relieved and the one way valve will keep outside debris from entering.

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'''datsunzcar84:''' <small>(2007-03-29 01:34:26)</small>

yes i remove it slowly … now… if not gas shoots out.... I am going to try to drop that tank this weekend and work foreward … hopefully i will find the source ....

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'''SATAN:''' <small>(2007-03-29 01:41:05)</small>

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If you dont want a headache later, when you drop your tank, you can use a sawzall to cut a access hole so you can get to your fuel pump and all of the lines.

This way later when you do stuff you wont have to drop the tank again.

Oh also, in one of the manuals it says NOT to remove the filler neck from the actual tank do to the fact that it wont seal right after you do. Thats what it says, dont know for sure if its true but I just drop the tank with the filler neck still attatched.

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'''Firehawk:''' <small>(2007-03-29 08:43:01)</small>

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Thats what I do. No problems.

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'''G-E:''' <small>(2007-03-30 10:54:01)</small>

you more or less have to keep it attached so you don't spill any gas.... and the filler retainer ring is easy to undo