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CEL for EVAP #4494090
08/20/17 09:53 PM
08/20/17 09:53 PM
Joined: Jun 2009
Posts: 785
Chicago
bowlofturtle Offline OP
bowlofturtle  Offline OP
Joined: Jun 2009
Posts: 785
Chicago
Just curious on this because i've heard this so many times and i think its the #1 seller of gas caps.

Say you have a CEL for evap, how often has the actual fix be a gas cap? I hear it all the time when i'm in the parts store or from non-car friends.



Honestly, about 2 out of 15 times i've looked at a car has it been actual gas cap. And of those 2 times, it literally was user error. Owners did not fully tighten the gas cap or somehow cross threaded it. The other times i want to say, about 10 were evap purge valve or solenoids. And lastly were just vac or fuel lines. Maybe it just my luck and what i've seen.

BTW, i really hate those type of CEL because the DIY like myself doesn't have a need for a smoke machine or a scanner that can activate the evap sensors.


My toys
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Re: CEL for EVAP [Re: bowlofturtle] #4494143
08/21/17 01:51 AM
08/21/17 01:51 AM
Joined: Apr 2016
Posts: 781
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline
Joined: Apr 2016
Posts: 781
Specific Ocean
It's the cheapest fix before bringing it in to a competent mechanic for a diagnosis. If you check out Eric's diagnostic videos on his SMA Youtube channel he doesn't just throw on a gas cap for a P0456 or other evap code. It's watching videos like that makes me want to step up my game in diagnosing issues and not just throw parts and hopefully the code stays away after clearing the codes.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: CEL for EVAP [Re: bowlofturtle] #4494169
08/21/17 04:50 AM
08/21/17 04:50 AM
Joined: Jan 2010
Posts: 1,740
Rochester, NY
NateDN10 Offline
NateDN10  Offline
Joined: Jan 2010
Posts: 1,740
Rochester, NY
I'm dealing with a P0442 code right now on our Mazda 5. Replaced the gas cap first because it was only $8, so why not try it? It was not the gas cap.

Last edited by NateDN10; 08/21/17 04:51 AM. Reason: Autocorrect

2016 Mazda3 - 20,000 mi.
2011 Toyota Sienna - 100,000 mi.
Re: CEL for EVAP [Re: bowlofturtle] #4494229
08/21/17 06:48 AM
08/21/17 06:48 AM
Joined: Apr 2013
Posts: 180
Kevil,Ky
vwmaniaman Offline
vwmaniaman  Offline
Joined: Apr 2013
Posts: 180
Kevil,Ky
On My Ram 1500, found out that the P0465 was happening because I would pump in more gas after the pump kicked off. I stopped doing that after seeing that solution on the Ram Forum and now no more clearing codes.


Don't waste your time on a slipshod repair.
Re: CEL for EVAP [Re: bowlofturtle] #4494243
08/21/17 07:12 AM
08/21/17 07:12 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
Originally Posted By: bowlofturtle

Say you have a CEL for evap, how often has the actual fix be a gas cap?


Almost never. In 15 years and hundreds and hundreds of fixing evap leaks, only once have I seen a bad gas cap.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
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Re: CEL for EVAP [Re: NateDN10] #4494309
08/21/17 08:51 AM
08/21/17 08:51 AM
Joined: Jan 2013
Posts: 2,068
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,068
Texas
Originally Posted By: NateDN10
I'm dealing with a P0442 code right now on our Mazda 5. Replaced the gas cap first because it was only $8, so why not try it? It was not the gas cap.


Now you have a spare gas cap . :-(


Wyr
God bless
Re: CEL for EVAP [Re: WyrTwister] #4494361
08/21/17 10:00 AM
08/21/17 10:00 AM
Joined: Dec 2015
Posts: 261
Ontario Canada
Canadastang Offline
Canadastang  Offline
Joined: Dec 2015
Posts: 261
Ontario Canada
I've had a recurring EVAP code in a Honda that was caused by a bad gas cap. The ratcheting mechanism became weak with age and didn't allow the cap to be properly 'torqued' so to speak.

Never changed the cap, I just squeezed the sides of the cap real tight while reinstalling the cap to bypass the ratchet mechanism. Never had the code again lol.

Re: CEL for EVAP [Re: bowlofturtle] #4494403
08/21/17 11:01 AM
08/21/17 11:01 AM
Joined: Mar 2014
Posts: 3,471
NJ
Leo99 Offline
Leo99  Offline
Joined: Mar 2014
Posts: 3,471
NJ
I've had the evap code throw on 3 cars. Once it was the gas cap. The gasket had hardened. Other time it was the cannister. Replaced that and all fixed. Still dealing with the code on the 3rd vehicle. New gas cap didn't fix it.

Going to reset the CEL and see if it stays off.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: CEL for EVAP [Re: bowlofturtle] #4494437
08/21/17 11:57 AM
08/21/17 11:57 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
I have a P0452 code pop up about twice a year; always during hot weather. The code clears itself after a few ignition cycles.

Re: CEL for EVAP [Re: bowlofturtle] #4494610
08/21/17 03:47 PM
08/21/17 03:47 PM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,949
Illinois
I've seen rust on the gas cap sealing surface on my Accent. Some sand paper and clear coat fixed that.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: CEL for EVAP [Re: bowlofturtle] #4494701
08/21/17 05:50 PM
08/21/17 05:50 PM
Joined: Aug 2004
Posts: 1,401
VA
Rhymingmechanic Offline
Rhymingmechanic  Offline
Joined: Aug 2004
Posts: 1,401
VA
P0452 on my '01 Silverado turned out to be chewed wiring for the fuel tank pressure sensor.

I already had a spare gas cap, the original, replaced with a lockable one after three years, and that didn't fix it. I was going to change the sensor, and the whole harness came off when I unhooked the plug.

Re: CEL for EVAP [Re: bowlofturtle] #4494712
08/21/17 06:04 PM
08/21/17 06:04 PM
Joined: Jan 2013
Posts: 2,068
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,068
Texas
Field mice ?

Best of luck , :-)


Wyr
God bless
Re: CEL for EVAP [Re: bowlofturtle] #4495252
08/22/17 01:00 PM
08/22/17 01:00 PM
Joined: Apr 2006
Posts: 9,278
Birmingham, AL
01rangerxl Offline
01rangerxl  Offline
Joined: Apr 2006
Posts: 9,278
Birmingham, AL
Gas caps don't fail as often as hoses, tubes, vacuum lines, purge valves, vent valves, etc.

I still sell a lot because that's what people want to try first. If they ask about CELs, I explain why it may not fix their problem and they generally understand, then come back for a vent valve kit later.

I've done it myself. My truck has a "check fuel cap" light that came on a few years ago. It didn't throw a CEL, just the check cap light, but it was an indicator of a sudden, large EVAP leak. I checked fuel cap, and even replaced fuel cap, but nothing. Finally I looked under the hood, and somehow one of the purge valve lines had come loose. I plugged it back up and the light turned off immediately.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 224K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 200K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 246K miles

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