Vented or Non-vented locking gas cap?
Thread Starter
Instructor
Joined: Aug 2000
Posts: 187
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From: Midwest City Oklahoma
Vented or Non-vented locking gas cap?
Local vandalism warrants buying a locking gas cap. Stant makes both vented and non-vented caps. I thought the system was pressurized and stock C4 caps were non-vented. Am I correct? Which should I purchase or does it really matter? Thanks for your answers on such a minor question. Bill
Drifting
Joined: Dec 2000
Posts: 1,733
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From: Sarasota FL
Re: Vented or Non-vented locking gas cap? (Fang S-289)
I think all of the EFI cars have non-vented caps to allow for fuel vapor recovery. Engine vacuum keeps the tank under negative pressure when the engine runs and a sealed cap prevents fumes from escaping while parked.
Pro
Joined: Jun 2001
Posts: 697
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From: College Station Tx
Re: Vented or Non-vented locking gas cap? (DON M)
Non-vented.
All gas tank venting is handled through the Charcoal canister (in order to reduce VOC emissions). If you put on a vented cap chances are you will get a SES light (on a OBDII for sure you will).
Regardless though, non-vented.
All gas tank venting is handled through the Charcoal canister (in order to reduce VOC emissions). If you put on a vented cap chances are you will get a SES light (on a OBDII for sure you will).
Regardless though, non-vented.
