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I crawled under the car to check out the evap canister, etc, and I found some broken and missing tubing (I’ve recently gotten a CEL (P0497 Evaporative Emission System Low Purge Flow) 2004 Civic w/ 1.7L). I’ve been searching online to see what I need to fix, and I am posting to see if you folks know what is missing in this photo. The red, white, and yellow arrows point to tubing.
The orange arrow points to tubing, maybe. It’s different than the other 3 tubes. I’m fearful that the orange arrow points to an electrical wire shroud. Any guidance will be appreciated.


More photos -----> are online here, but there's not much more to see: https://photos.app.goo.gl/YHCMpjurMDs9yXzP9 <----- more photos

 
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Looks more like a mouse chewed through the hoses.
could probably get them pretty cheap at the junkyard

 
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Red and white should be connected together. Orange is a vacuum line that goes up towards the engine bay. I am unsure what orange goes to without looking under my own car.

 
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Thank you very much for that. I was planning on trying that approach b/t the white and red hoses. In fact, the torn edges of the hoses kinda line-up. That gave me confidence, and your post makes it even better.
The orange one I'm going to connect to the yellow.

And this is so strange in that it visually appears that this damage should have takensome time to occur. But the CEL came on just last week. In any event, I'll hook things up and report back in a few days.

Thanks again!

 
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I think you are correct. I wasn't thinking that the evap is behind the fuel tank. Orange probably switches to a hard line, up over the tank, then to the engine bay.

EVAP leaks usually take a few trips before throwing a fault. At least, I can clear the fault on my CRV and it won't come back for 2-3 days.

 
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Yep made a few cars pass emissions with evap issues because it takes a while to code

 
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Hi everyone,
An update on this evaporative tubing issue. After reconnecting the tubes (as planned in my last post), I took a test drive to the grocery store. On the way there, just a couple miles away from home, the CEL illuminated. When I got back home I scanned to find a P1457. I reset it and figured I had more to work on. I pulled it into the garage and parked it, but didn’t jack it up. Overnight, as I had time to think about it, I wondered that it’s possible -possible- that the OBD was sensing the evap system resetting after being open to the atmosphere. My fingers are crossed that the CEL doesn’t come back on; it’s been on ~7 local trips in the six days since I reset the P1457.

Y’all have a good week!

 
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Usually filling up the tank will make it come back sooner. Hopefully it won't.

 
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I'll give that a try.

 
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I didn't have to fill it up. The CEL illuminated (P1457) on the way to the park yesterday.

 
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Now comes the very fun part, troubleshooting.

 
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This.

That's rat damage for sure. If you look closely you can see the chew marks.

I would check my electrical wiring around that area too, since it's near a fuel leak

 
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You're right MuddFlapps. Upon close inspection, those are certainly tooth marks. I think it's squirrels; the furry little hellions are trying my patience. They are also eating the jalapeño (and other) peppers in my garden. I'll let them have the peppers if they'll leave my car alone.

I'm still researching and diagnosing the recurring issue.

Concerning the diagnosis... is there any significance to the fact that the P1457 codes come in pairs? Each time I check and reset it, there are two of them.

 
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One as active and one in history. Nothing to worry about there. This pictures is stolen from a YouTube video. Should give you an idea on how to troubleshoot. You will need a handheld vacuum pump.

 
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That is a great visualization of what code is from which part of the circuit. Thank you.

Can one rent a smoke machine and vac pump from the AutoZone, Oreily, et al?
Are there any recommended home-brew methods to obtain the vacuum, such as a large syringe or similar?

 
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if you smoke or vape, no smoke machine needed...

 
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That’s great news, and one hurdle easily overcome. I do enjoy an occasionally smoke from time to time.

 
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No idea if you can rent a vacuum pump but you can buy one from Harbor Freight for like $25.

 
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And this thread keeps delivering good news. Harbor freight is nearby. I'll pay them a visit.

I have a like-new vacuum pump i got from some garage sale or something, but it has a 220 volt motor. I was looking at wiring/plugs and such to connect it to my dryer's electric supply, but the Harbor Freight plan seems more likely.

Y'all have a good day out there!

 
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You just need a little hand pump. The electric one would be for like ac systems

 
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220 volt? for a vacuum pump? that's crazy.....that thing could probably suck the wind out of a politician....

 
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Like this. Just don't expect it to last if you regularly use it.

 
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is that one of those... Enlargement kits?

 
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Only if you shave the shrubs

 
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Cool. I'm glad to know that will do it. My buddy has one that he bought to bleed brake lines. It never really caught my eye, `cause I've not had much success bleeding brake lines from that side of the pressure curve. But I'm sure he'll let me borrow it. Heck, for $20, I should just buy my own.

That cracked me up! But I don't know that the vacuum of outer space would have an effect on one of our politicians.

And, upon inspection, my 220V pump won't work here in the US. Its circuit is wired for Asian voltage of 220V/50Hz. It was left-over from an old job, and I thought I may get another use out of it. I'd forgotten it was 220v and now I'm wondering how it ended up in my shop at all. But I digress.

 
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Might be able to change the motor. Or run it at 240v 60hz, it just wouldn't be super happy

 
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there should be some converters around

 
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Hi Everyone, It’s been a while; I hope y’all are doing well.

So, I think I solved the problem. I’ve been driving it for more than a week now since I performed the repair. No CEL illuminations have occurred. Below my rambling is the TLDR.

Here’s what happened: I crawled under to have another look. I was thinking I may have overlooked something simple. Perhaps (as mentioned by MuddFlapps), the squirrels had cut a wire, too. I’ll admit that the initial shock I experienced when I viewed the vast expansive emptiness of the missing tubes, that shock was consuming. So much so that I didn’t spend a significant amount of time looking at all the other components that were close by. A rookie mistake. Crawling under this second time, I was hoping for a quick inspection, a certain ah-ha moment, and an easy fix.

Well, that wasn’t what happened. Wearing my 2x, reader safety glasses, I scooched under there with my flashlight. To my dismay, everything looked solid upon inspection. Looking especially solid was my professional shade-tree repair work. As I shimmy-ed back out from under the car, my heart was heavy.

I sat on my shop stool and sighed a few times. The temporary depression got me to questioning my health, my life, and my automotive repair skills. And it was at this (relative) low point that I had a eureka moment. I reasoned that it would be simple (and prudent) for me to slide back under the mighty Civic and just swap the lines that I had repaired/restored. I would just switch them to the opposite taps coming off the valve. I told myself, “when you began this project, you really didn’t know what tube went to which tap”. I had a 50:50 chance of success. The fact that the machine started and drove gave me the false conclusion that I had scored BIG. But sitting here with my head in my hands gave me the new perspective that perhaps swapping the tubes would be the way to go. And if it was the wrong move, and the car blew-up upon restart, well, I was depressed anyway.

* * TLDR : I connected the tube with the red arrow to the tap that the yellow arrow points to (and the orange to the white), and that seems to be the remedy.

On the test ride (after this tubing swap), I told my dog that if this easy fix solved the evaporative emission CEL issue, that I would diagnose his faulty driver-side rear window. So now I’ve got another Civic repair on the list, ha! But this window-issue is small potatoes; he can hang his head out the passenger side (...of his best friend’s ride, tryin' to holla at me).

Thanks again for your support and comments. Y’all are great.