Loose Gas Cap
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Le Mans Master
Joined: Jan 2008
Posts: 6,457
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From: corpus christi Texas
Loose Gas Cap
I have read treads in the past that if your gas cap is loose you will get a notice "right" or ?? Well every time i get gas my cap seems loose.I just got gas & i left the cap OFF & drove home & i got nothing in the DIC?? Shoulden the fuel system stay pressurized?? Thanks 
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From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Might be a check valve in the system or you need to start it 3 or 4 times of "fail" and it will toss a code.
Elmer
Elmer
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It's been experience that if the cap is loose (i.e. not sealed completely), your CE light will come on and codes will be stored (it seems to take a few ignition cycles for this to happen however - it doesn't happen immediately)
Tightening the cap and after a few more ignition cycles, the CE light will go out and codes will be cleared.
Happens to me at least once every few months.
Tightening the cap and after a few more ignition cycles, the CE light will go out and codes will be cleared.
Happens to me at least once every few months.
Melting Slicks
Joined: Mar 2005
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From: Las Vegas Nevada
2020 C8 of the Year Finalist - Unmodified
I had a similar problem and the advice I received on the forum was to only tighten the gas cap two clicks. I have been doing this every since and have had no problems.
Safety Car
Joined: Sep 2008
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From: Location: Location: kAnSaS
its only going to set a light under the right circumstances. Needs to be in closed loop (engine warmed up etc..) and most systems do the evaporative system check under light load while at cruise speeds over a certain speed, i think its 50. If you only do short trips it wont turn the light on. Some manufactures (like chrysler) should but dont kick the light on on some models (all OBD2 cars (cars 1995 and newer) are required to have an evap system check, but a few dont seem to kick the light on) and some manufactures like ford actually have a "check gas cap" dedicated light/ Take the cap off and take a trip down the hightway, should kick the light on
Last edited by HANNY; May 2, 2010 at 09:31 PM.
Team Owner
Joined: Oct 2004
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From: San Clemente CA
its only going to set a light under the right circumstances. Needs to be in closed loop (engine warmed up etc..) and most systems do the evaporative system check under light load while at cruise speeds over a certain speed, i think its 50. If you only do short trips it wont turn the light on. Some manufactures (like chrysler) should but dont kick the light on on some models (all OBD2 cars (cars 1995 and newer) are required to have an evap system check, but a few dont seem to kick the light on) and some manufactures like ford actually have a "check gas cap" dedicated light/ Take the cap off and take a trip down the hightway, should kick the light on
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