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Re: Gas tank venting problem - help!
[Re: aar1]
#444933
08/23/09 08:56 AM
08/23/09 08:56 AM
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Joined: Sep 2003
Posts: 1,688 Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Quote:
Here is a picture of my gas cap. This is what is on my gas tank that has no vent nipple. It says "Anti Surge" above the tabs and says "Vented" below the tabs.
Is this cap meant to let air in and out?? Or just let air in as the fuel level drops?
That sure looks like a pressure-vacuum cap. It will let make-up air in unrestricted, and let air out (pressure from expansion) out once a predetermined PSI / KpA is reached. I guess it can fail like anything else mechanical.
It is normal to hear a "whoosh" when removing it.
It is unusual to see one of those without the second set of bayonet tabs, which are designed to keep the cap from hitting you in the face. Maybe first year for the design?
Rick
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Re: Gas tank venting problem - help!
[Re: Rick_Ehrenberg]
#444934
08/23/09 11:27 AM
08/23/09 11:27 AM
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Joined: Aug 2007
Posts: 6,100 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,100
Valencia, España
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when day is hot or I have shaked the car a lot when driving I'm able to hear a WHISTLE comming out from gas cap ( Stant "vented" ) Whistle comes from rubber seal. I simply moves a little bit the cap and pressure is enough released to quit the whistle.
I have known the "vented" is mainly to allow the air get in as far fuel goes down BUT who cares about air coming in if anyway vapor gas presssure is getting inside ? it won't need get air in with all the vapors.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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