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P0457 small evap leak


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Knock on wood... I may have gotten away with a simple fix for this.

 

Over the past few thousand miles, I would get a CEL with this code. I replaced the gas cap again, as I did a few years back. Remember I'm retired now so I don't rack up the miles like I used to.

 

About a month ago I saw a video showing how to make sure the valve is not leaking. You can blow into the ports and suck on them. If you can't blow or suck air, the solenoid valve is good. (the light blue connector)

 

I took mine off a couple of weeks ago and could not blow or suck through it. When I put it back on, I zip tied the three hose ends.

 

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Edited by Max Capacity

304,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.

 

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Zipties and vacuum caps on these cars break too y'all, never forget to check them every so often. You'd be amazed at what trivial things can break and how they can affect a turbo car! I still couldn't believe I had a boost leak out the passenger side cam position sensor. That little o-ring turned into a brick and that was the end of it. Car had trouble starting, poor MPG, whole works.
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Thanks Max. I am getting P0442 quite often, may try sucking and blowing since that valve is all original... and no zip ties.

 

 

 

Otoh, the rear passenger side stinks gas here and there, which sucks on itself.

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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Thanks Max. I am getting P0442 quite often, may try sucking and blowing since that valve is all original... and no zip ties.

 

Otoh, the rear passenger side stinks gas here and there, which sucks on itself.

Wonder about your fuel filler neck. Noticed mine was pretty rusty in some spots earlier this year. Hit it with a bunch of fluid film to hopefully stop it from spreading. It doesn't look like it'd be super hard to replace when I was fiddling with the wheel well liner removed and stuff, but looks could be deceiving. In the thread below they said it's a pita

 

Pic max posted in the past

https://legacygt.com/forums/showpost.php?p=5837785&postcount=7

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I might drop the liner to assess the condition of the filler neck and related lines. The CEL says "small leak" and the smell is not coming too often, so I am hoping the neck itself is OK. If it comes to that I as well look at the tank and rear brake lines - dropping subframe is not something I want to do at some point again.

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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Oh well, the codes came back. P0442 and P0457. It's been over 600 miles.

 

When I walked near the gas cap, I could smell a little gas. I reset the CEL, zeroed the "trip meter". I drive it for a while and wait until my garage is finished before I decide to pull the rear wheels and fender liners and see what things look like.

304,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.

 

Engine Build - Click Here

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Going off memory, I thought maybe you could inspect the problem areas on the fuel filler pipe without removing the fender liner, so I checked today out of curiosity. In max's picture that I posted above , you can see the really rusty area without removing anything, but to inspect the rest, you really do have to pull back the fender liner (I know that may be obvious).

 

I took a bunch of pictures in case they might help someone in the future. The first time I did this I removed the fender liner, which was a little annoying with the little air flap that sits in front of the wheel. This time around I removed most of the fasteners, and just pulled it back and held it back with a bungee cord, not touching the little air damn thing that sits in front of the wheel. In the last picture, the two red circles are fasteners that are kind of hidden, especially the one on the right. The first picture is what you can see without pulling back the fender liner, fuel filler neck circled in blue

1.thumb.jpg.20fe072969707ed1d3179e39b3ca081e.jpg

2.thumb.jpg.dcbb8d9fb18184821a47cf4c55a0d3cb.jpg

3.thumb.jpg.d627e248e8fa6b67a7a76ce2a0dcc61c.jpg

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5.thumb.jpg.9119f669229c18435922671d86aab855.jpg

6.thumb.jpg.410c6116a892103b7e66c8aae6dd8505.jpg

Edited by apexi
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Thanks for the pics, very helpful. I think this is where the root cause of cell P0442 I am getting is - I did look at the engine and recalled that everything I could buy was refreshed about 3 years ago when I pulled the engine and tranny for 6 speed swap. Including all the small houses and such around intake.

 

 

Apexi did you find here the leak is actually coming from? Just curious if it can be patched somehow for the time being.

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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My filler pipe didn't have any leaks so I'm not sure if they can be patched. I can't remember why I removed both rear fender liners during the summer. I think I was fluid filming parts of my car, and I removed them for better access. Edited by apexi
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Gonna see how much it will add to my tank replacement to get a new filler neck.. Would help prevent a future major issue

 

 

Makes sense to replace filler neck if the tank is being replaced, imho...

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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So today - 90 miles up north to Ayer Mass, full day of autocrossing, then 90 miles down south to home - and not a single peep from damn CEL. Gas smell is there.

 

 

 

Did I say before that cars are like women?

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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Interesting. Much easier to check the pump housing than drop the gas tank.

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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Have you had the car smoke tested yet?

 

These small leaks can really be a bear to track down.

 

 

 

 

I have not. Some other things need to be taken care of, so it comes to priorities.

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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Well today the CEL came back on P0442. When I went to put gas in the tank, I could not fill the tank at normal fill rate. The nozzle kept clicking off.

 

I'll have to check out that issue. I know there are threads here about it.

 

The engine started fine after I put 5 gallons in. I reset the cel, car started fine.

 

 

Here's one thread I found, https://www.subaruoutback.org/threads/gas-pump-kicks-off-when-filling.39645/page-3

Edited by Max Capacity

304,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.

 

Engine Build - Click Here

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304,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.

 

Engine Build - Click Here

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Well today the CEL came back on P0442. When I went to put gas in the tank, I could not fill the tank at normal fill rate. The nozzle kept clicking off.

 

I'll have to check out that issue. I know there are threads here about it.

 

The engine started fine after I put 5 gallons in. I reset the cel, car started fine again.

 

 

Here's one thread I found, https://www.subaruoutback.org/threads/gas-pump-kicks-off-when-filling.39645/page-3

 

 

 

 

Interesting. I do not believe my wagon has that problem, yet it throws P0442. Just walked past it in garage, faint smell of gasoline and the car wasn't driven for 2 days.

2005 LGT Wagon Limited 6 MT RBP Stage 2 - 244K

2007 B9 Tribeca Limited DGM - 243K

SOLD - 2005 OB Limited 5 MT Silver - 245K

SOLD - 2010 OB 6 MT Silver - 205K

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