GTV6 Gas Tank Noise - Alfa Romeo Bulletin Board & Forums

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Old 12-06-2007, 03:53 AM
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GTV6 Gas Tank Noise

Recently the gas tank on my GTV6 has started to make a noise when I shut the engine off after driving the car. The sound is like a piece of metal that flexes back to it's orignal shape from a distorted shape. It's almost like there's a pressure buildup that finally releases after the car is turned off. Has anyone had a similar problem or any ideas on what's causing this???
Thanks
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[B] [COLOR="Red"][U][B]Current Alfa's[/B][/U][/COLOR]
[B]1995 164LS[/B]
[B]1990 Spider Quad[/B]
[B]1986 GTV6[/B]
1971 GTV 1750[/B]
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Old 12-06-2007, 09:32 AM
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After you shut off engine, what happens if you open the gas cap?
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Old 12-06-2007, 09:41 AM
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I can hear the pressure releasing, but still get a bang from the gas tank.
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[B] [COLOR="Red"][U][B]Current Alfa's[/B][/U][/COLOR]
[B]1995 164LS[/B]
[B]1990 Spider Quad[/B]
[B]1986 GTV6[/B]
1971 GTV 1750[/B]
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Old 12-06-2007, 09:43 AM
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I've also noticed that the bang I get from the tank is louder when there is less gas in the tank. With a full tank the sound is more muted.
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[B] [COLOR="Red"][U][B]Current Alfa's[/B][/U][/COLOR]
[B]1995 164LS[/B]
[B]1990 Spider Quad[/B]
[B]1986 GTV6[/B]
1971 GTV 1750[/B]
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Old 12-06-2007, 09:57 AM
mjr mjr is offline
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tank over pressurisation. empty tank, remove vent valves, and clean
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Old 12-06-2007, 10:14 AM
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Thanks for your feedback, will let you know the results when I'm able to clean the valves.
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[B] [COLOR="Red"][U][B]Current Alfa's[/B][/U][/COLOR]
[B]1995 164LS[/B]
[B]1990 Spider Quad[/B]
[B]1986 GTV6[/B]
1971 GTV 1750[/B]
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Old 12-07-2007, 09:26 AM
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I have the same on mine..... Where is the ventilation placed?
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1986 GTV6 3.0 12V
2002 156 GTA SW
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Old 12-07-2007, 11:14 AM
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Group 4

This .pdf of Group 4 should help. On my 1982 I don't have the canister (#4).

Check valve is (#9) located under rear deck lid cover behind and above rear seats.

Problems usually occur when oily residue accumulates in areas 3, 4, and 6; occasionally blocked check valve.

Greg Gordon has an outstanding a tech bulletin on this:
L-Jetronic

Here are 1987 Tech notes from the late great Fred Di Matteo (Velocissima-AONE)

And for the 1983 and before models; EMM.pdf attached, section D-21 from Group 4, probably best shows the check valve in question #3 (notice no charcoal canaster; in 1983 and before from oil separator to firewall then hardline (#2 - on vehicle interior) to rear of alfetta where check valve placed in line prior to vent line and expansion tank)
Attached Images
File Type: pdf Group4_pg4-18_ESLDP.pdf (344.6 KB, 144 views)
File Type: pdf Tank Pressure problems.pdf (450.9 KB, 121 views)
File Type: pdf EMM_Pg33_D21_FS_leakage.pdf (310.3 KB, 107 views)

Last edited by Balocco211; 12-07-2007 at 08:20 PM.
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Old 12-07-2007, 05:17 PM
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Thanks Balocco211
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1986 GTV6 3.0 12V
2002 156 GTA SW
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Old 03-08-2008, 07:19 PM
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Clogged vent valves was my problem. After cleaning no further problem
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[B] [COLOR="Red"][U][B]Current Alfa's[/B][/U][/COLOR]
[B]1995 164LS[/B]
[B]1990 Spider Quad[/B]
[B]1986 GTV6[/B]
1971 GTV 1750[/B]
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Old 03-10-2008, 03:08 PM
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Missing Vent Valve

My car does not have a vent valve (removed by PO?).
Does anyone know of a suitable replacement?
Thanks for your help..
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