Gas spewing out of filler neck? RESOLVED - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-08-2007, 12:17 AM   #1
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Default Gas spewing out of filler neck? RESOLVED

Recently, I've experienced two gas spewage out of my filler neck when I opened the gas cap. It was approx a gallon worth of gas.

The gas tank was not full. First occasion, I had about 80 miles on the gas which would be about 4-5 gallons already gone. Second occasion, filled up tank (stopped when the pump clicked off), it spewed gas out when I opened the gas cap TWO hours AFTER I last drove it.

I asked a few people and they're absolutely mystified. What causes this?

(I think htis is more of a general chat than mechincal)
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Old 10-08-2007, 12:22 AM   #2
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ive heard of the caps not pressure venting, and causing pressure to build up, but not like that. a gallon!!! idk thats i head scratcher.
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Old 10-08-2007, 12:22 AM   #3
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my first impression would be that it would have to be something with the evap system letting pressure build up.
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Old 10-08-2007, 12:22 AM   #4
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could it be evap/vacuum related with the FPR?
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Old 10-08-2007, 02:04 AM   #5
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i would replace the gas cap to start off if i was you...
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Old 10-08-2007, 10:16 AM   #6
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Cody, I think that this probably is a mechanical issue and related to your previous mechanical thread where we suggested that you had an evap line problem. It seems obvious to me that one or more of the lines from your gas tank to the evap system is clogged or pinched. You need to find out which one and repair or replace it.
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Old 10-08-2007, 11:37 AM   #7
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Cody, until you get a new cap, dont just open it right away. Loosen it, let it simmer down, then take the cap off that way you dont lose you highly expensive gasoline.
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Old 10-08-2007, 12:59 PM   #8
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Quote:
Originally Posted by lash
Cody, I think that this probably is a mechanical issue and related to your previous mechanical thread where we suggested that you had an evap line problem. It seems obvious to me that one or more of the lines from your gas tank to the evap system is clogged or pinched. You need to find out which one and repair or replace it.
I know, I asked a moderator where I should put it, it was suggested to put it in Gen. Chat so i did.

And I have replaced the gas cap twice.
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Old 10-08-2007, 02:20 PM   #9
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If your tank is pressurizing, you have an evap issue. Judging by your other topic, I think it fits.

I suspect your evap solenoid is bad.
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Old 10-08-2007, 02:40 PM   #10
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Quote:
Originally Posted by willwren
If your tank is pressurizing, you have an evap issue. Judging by your other topic, I think it fits.

I suspect your evap solenoid is bad.
The one above the valve cover or the one on the canister?
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