'97 2.7 hose between air cleaner and charcoal canister

I just bought a 1997 2.7 4WD ExtraCab Tacoma. I notice the ports are open, yet there is no hose between the air cleaner and charcoal canister. I plan to run a hose, but I'd love to have someone post a picture of your truck so I can see how that hose is run. It looks like it would make most sense to run it attached it to the fan shroud, but that may not be the way it is done. I look forward to seeing a picture.

 

As mentioned in the PM we discussed, I don't have a picture, but the hose in question has a short metal pipe with mounting brackets on it that bolt to the top area where the radiator is, then there are two hoses on each end that connect to the airbox, and then the charcoal canister. Free bump here. Hopefully someone can post a picture of their 1st gen 2.7 underhood please.

 

Here are some photos from my '99 3rz. The first shows the hard-tube attached to the shroud with little brackets and bolts :

 

Perfect! I knew SOMEONE would have a pic or two! There you go OP!

 

Thank you very much. I anticipated it would make sense to run it that way,but I guess the metal pipe was never replaced after the truck underwent front end damage. I think I'll just run a hose without the metal pipe, unless you can tell me a reason I need to make that expense.

 

It's more rigid, and easier to mount.

You could just use some brake line I imagine. Just for mounting purposes.

 

I have some copper tubing I could use, I guess. What exactly is the purpose of this line? How much pressure and in which direction does it flow? Does it need to have the 1cm or so clearance the entire path, or can it get larger or smaller? I barely passed smog, having the max of 52ppm of HC at 15mph (All else was fine). Could this have affected the results? Thanks for the help.

 

I believe the charcoal canister is to catch gas vapours and recirc them back into the engine so they don't bleed to atmosphere.. But I could be wrong.. The line under the hood probably goes to the canister purge valve? maybe? Again just guessing. If my thesis is correct, it's not an essential part, and really doesn't affect the hydrocarbons coming out of the tailpipe. However.. That hole in your airbox, if it's after the filter you may want to plug it so you're not sucking in unfiltered air into your engine, that'll cause you to burn oil and whatnot.

I hope I helped!

 

There is no pressure in that line, maybe a small vacuum. I'm thinking what without the hard line, there would be a chance for the rubber line to flop down into the nearby fan, or spinning drive belts.

If I were in your shoes, I'd use an appropriate sized rubber line for the entire length, and use those 2 amall clamps (from a picknpull ?) to secure the rubber line where the hard line used to be. Then eventually obtain a hard line to 'make it right' .

 

That line, if memory serves, if for the fresh air intake to the EVAP system. You don't want the EVAP fuel vapor system to draw in dirty, dusty air. So it uses that spot behind the air filter to draw in the fresh air. So it is a hit/miss as far as vacuum there. Very minimal really.

 

I guess size of tubing would be irrelevant, then. I'll just see what I have available and bend it to shape.

I may check into possibly using a larger rigid tube and just running the hose through it.

 

I assume you are talking about the rubber tubing here. The only size that really matters is ID ( inside diameter ) of the hose, so that it will fit properly over the 2 OEM ports at each end. If you can't find OEM hose of that length, you'll have to get aftermarket hose, which will likely have thicker walls, therefore a larger OD ( outside diameter ).

 

I was talking about the rigid tubing, not the hose. I'm leaning toward using a piece of 1/2" rigid copper pipe, but I have to see the OD of the hose I pick up today, to make sure it fits through it. I have plenty of scrap pipe laying around, so I'm sure I can find something copper or aluminum to run the hose through.

 

Gotcha. Sounds like a fun, creative project. Take a photo when you're done and post it.

 

No problem.

 

You asked for pictures, so here they are. I decided to use 3/8" copper tubing across the shroud. I covered it with an old washing machine hose (being a packrat comes in handy at times), to give it some added protection. I couldn't find vacuum lines at AutoZone, so I bought 3/8" transmission cooler hose, which has thick walls. I used some strapping to attach the rigid part to the shroud and then connected the hose from that to the air cleaner and charcoal canister. Here are the photos:

 

That looks fantastic. Looks almost stock. Great job. I'm amazed you got all the parts together and assembled in such a short time.

 

It only took me about 15 minutes to put it all together, once I purchased the hose.

Before I got the parts, I thought I needed to plug the holes to keep dirt out. I discovered that created a vacuum in the charcoal canister. I heard a nice little pop when I pulled off the cap from that.

 

I just notice that my line to the air filter was disconnected. Have been having strong smell of gas in warm weather, especially. Would this line being disconnected have anything to do with that? Never throw a code. Weird!

 

I know this might be a long shot due to the age of this thread and the possibility of anybody being able to answer, but would anybody happen to have a link or list of OEM or aftermarket parts to replace the whole fresh air intake to the EVAP system??