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Old 07-16-2004, 07:38 AM   #1
Hitokiri
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Default fuel stink on RSt = check valve?

Ok so I wish I could search.... grrr

My car stinks like gas on boost.

Are there some check valves I need upon adding boost?

Todd
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Old 07-16-2004, 07:40 AM   #2
Hitokiri
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yeah

I am an idiot

just answered my own question. Sorry all.

http://www.sportcompactcarweb.com/pr...sccprojsubaru/

Todd

edit: quote from Shiv in article

"Could positive manifold pressure (something a stock 2.5RS was never designed for) be pressurizing the canister, causing it to leak gasoline fumes into the cabin? To test our theory, we installed a one-way check valve into the manifold vacuum purge line just behind the intake manifold. Simply put, this little trinket keeps the boost from blowing into the charcoal canister while still allowing the purge system to function as designed. Eureka! With the check valve installed, we're happy to announce that the fuel stink is gone. Our remaining brain cells couldn't be happier."

Last edited by Hitokiri; 07-16-2004 at 07:47 AM.
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Old 07-16-2004, 11:09 AM   #3
Elliot
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where odes the check valve goes?
pictures please!!

Elliot
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Old 07-16-2004, 11:21 AM   #4
maxiav
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If you are standing in front of the car... to your right, there should be a small tube coming out of the intake manifold..... I think this is it......

So I guess you install the check valve, so that air only flows in to the intake manifold.... right?
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Old 07-16-2004, 11:25 AM   #5
Elliot
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Ok I'll look for it today!!

Elliot
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Old 07-16-2004, 12:13 PM   #6
Wedge
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Quote:
Originally posted by maxiav
If you are standing in front of the car... to your right, there should be a small tube coming out of the intake manifold..... I think this is it......

So I guess you install the check valve, so that air only flows in to the intake manifold.... right?
I don't think so, the manifold vacuum purge line is located behind the manifold, underneath to the left.

-Vic
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Old 07-16-2004, 12:19 PM   #7
maxiav
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Guess I was wrong.... OOPS..... I have to look at my car once I get home... but go with what he ^ says....

Vic, when you say to the left, do you mean "YOU" looking at the car left... or the left of the car (driver's side)....?
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Old 07-16-2004, 12:30 PM   #8
Wedge
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Sorry, I hate it when left and right gets mixed up on cars.

But I meant left when looking at the car, so passenger side.
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Old 07-16-2004, 12:40 PM   #9
Hitokiri
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ok i bought a check valve over lunch.

ok.. the lines comes out from under the passanger side of the intake manifold.

Where does it go to after that? for the sake of making it easier to locate. What ID is the tube? 1/4? Cause the check valve I got is pretty small.

Todd

edit: pic + caption


and the caption by Shiv:
"Who would have thought that a $2 check valve from Monument Auto Parts would solve our fuel stench problem? It should be noted that OEM turbo Imprezas already come equipped with such a valve from the factory."
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Old 07-16-2004, 12:54 PM   #10
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In between the purge solenoid and the intake manifold. That vacuum line that comes out of the top of the manifold.

-Brett
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Old 07-16-2004, 01:02 PM   #11
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I'm confused.. I was reading a reply from ScoobaruRS and now it changed....
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Old 07-16-2004, 05:21 PM   #12
crash
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I'm confused too...


The vacuum line that comes out of the top of my manifold goes to my TEC MAP sensor...

-Nate
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Old 07-16-2004, 06:33 PM   #13
Wedge
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Hope this helps....



So, the check valve would go from the line that comes out of the manifold, correct?
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Old 07-16-2004, 06:51 PM   #14
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The JC sports instructions explaines it

Page 25 - #91,92
http://www.imprezars.com/images/turb...rboinstall.pdf

Anthony C
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Old 07-17-2004, 06:35 AM   #15
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Quote:
Originally posted by maxiav
I'm confused.. I was reading a reply from ScoobaruRS and now it changed....
Because I'm too quick...

Actually the first thing I wrote was basically that you would put the check valve in between the purge solenoid and the charcoal canister. All though that would probably work, it would make a little more sense to put it in between the PCS and the manifold.

-Brett
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Old 07-17-2004, 07:59 AM   #16
Hitokiri
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!!! I did it and I don't notice the stink nearly as much!!!!

although backing up will never not stink with no cats....
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Old 07-17-2004, 08:44 AM   #17
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Is this just a MY99 problem? I don't seem to have this problem on my MY00.
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Old 07-19-2004, 11:59 AM   #18
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YES!!!!!!! It worked!!!! I'm going outside to take a pic of the install right now!


Last edited by Wedge; 07-19-2004 at 12:16 PM.
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Old 07-19-2004, 01:27 PM   #19
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Same questions as above. Does this apply only to MY98-99? I have a MY01RST and I haven't smelled gas yet. I do smell something, but its probably from the exhausts...burning lots of unnecessary fuel.

Ben
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Old 07-19-2004, 02:41 PM   #20
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Well, it's possible since I'm running 18psi that might have something to do with it.
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Old 07-19-2004, 04:26 PM   #21
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this only matters on MAF driven cars I beleive...
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Old 07-19-2004, 04:29 PM   #22
Wedge
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Negative, mine is MAP, and there is NO more fuel stink in the cabin while under high boost.
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Old 07-19-2004, 04:43 PM   #23
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whats odd is that i've never had a check valve on that hose and I have never had fuel smell even with 20 psi.... ????
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Old 07-19-2004, 06:01 PM   #24
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Yeah, it's strange. Friend has another RS-T just like mine, except with a 2.5STi shortblock, and he is also running 18psi. Never has his smelled.

I'm thinking perhaps the charcoal canisters go bad?

Either way, I'm so glad the smell is gone.
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Old 07-19-2004, 06:25 PM   #25
White 2.5rs
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how does that vacuum line stay on w/o a clamp?
it sees positive manifold pressure correct?

thanks
alex
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