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#4494090 - 08/20/17 10:53 PM CEL for EVAP
bowlofturtle Offline

Registered: 06/25/09
Posts: 745
Loc: 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.
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#4494143 - 08/21/17 02:51 AM Re: CEL for EVAP [Re: bowlofturtle]
Kibitoshin Offline

Registered: 04/19/16
Posts: 639
Loc: Kaiōshinkai
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.
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#4494169 - 08/21/17 05:50 AM Re: CEL for EVAP [Re: bowlofturtle]
NateDN10 Offline

Registered: 01/10/10
Posts: 1725
Loc: 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.

Edited by NateDN10 (08/21/17 05:51 AM)
Edit Reason: Autocorrect
2016 Mazda3 - 15,000 mi.
2011 Toyota Sienna - 91,000 mi.

#4494229 - 08/21/17 07:48 AM Re: CEL for EVAP [Re: bowlofturtle]
vwmaniaman Offline

Registered: 04/18/13
Posts: 86
Loc: 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.

#4494243 - 08/21/17 08:12 AM Re: CEL for EVAP [Re: bowlofturtle]
mightymousetech Online   happy

Registered: 04/03/17
Posts: 1230
Loc: 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.
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#4494309 - 08/21/17 09:51 AM Re: CEL for EVAP [Re: NateDN10]
WyrTwister Offline

Registered: 01/13/13
Posts: 1146
Loc: 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 . :-(
God bless

#4494361 - 08/21/17 11:00 AM Re: CEL for EVAP [Re: WyrTwister]
Canadastang Offline

Registered: 12/08/15
Posts: 261
Loc: 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.

#4494403 - 08/21/17 12:01 PM Re: CEL for EVAP [Re: bowlofturtle]
Leo99 Offline

Registered: 03/30/14
Posts: 2782
Loc: 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
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#4494437 - 08/21/17 12:57 PM Re: CEL for EVAP [Re: bowlofturtle]
Merkava_4 Offline

Registered: 01/30/07
Posts: 17501
Loc: 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.

#4494610 - 08/21/17 04:47 PM Re: CEL for EVAP [Re: bowlofturtle]
SHOZ Offline

Registered: 06/28/03
Posts: 5525
Loc: 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

#4494701 - 08/21/17 06:50 PM Re: CEL for EVAP [Re: bowlofturtle]
Rhymingmechanic Offline

Registered: 08/13/04
Posts: 1286
Loc: 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.

#4494712 - 08/21/17 07:04 PM Re: CEL for EVAP [Re: bowlofturtle]
WyrTwister Offline

Registered: 01/13/13
Posts: 1146
Loc: Texas
Field mice ?

Best of luck , :-)
God bless

#4495252 - 08/22/17 02:00 PM Re: CEL for EVAP [Re: bowlofturtle]
01rangerxl Offline

Registered: 04/08/06
Posts: 9220
Loc: 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 / 5-Speed Automatic / 2WD | 211K miles
1994 Ford Ranger STX | 4.0 V6 / 5-Speed Manual / 4X4 | 198K miles