3 Way Control Valve veb77 308

2794 Views 16 Replies 0 Participants Last post by Anthony A., Dec 6, 2003

G

Discussion Starter · Dec 4, 2003

Hi,

I finally got some time

Hi,

I finally got some time to finish changing my evap. emission lines. Something came up when I went to change the two lines going to the (what the manual states) 3-Way control valve. This is a whitish, plastic device located in the rear passenger wheel-well.

My evap lines were original, and based on the way the clamps were rusted in place, it is safe to say they have never been removed either. According to the manual printout I have (printed from Ferrari UK site), the LEFT side of the control valve, when looking at it head on from the wheel-well, is supposed to go to the bottom of the charcoal canister. The RIGHT side of the valve comes from another check-valve upstream.

Now unless the factory messed up, mine were reversed. The bottom of my charcoal canister goes to the RIGHT side of the control valve. I replaced them the way they were.

If this 3-way valve is bidirectional, this should not matter, but I am not familiar with how it should work.

Can anyone shed some light on this for me?

Also, although the evap lines are 7mm ID, it looks like someone replaced the fuel lines with 8mm ID. Is 8mm ID correct for the fuel lines?

Thank you,

Anthony

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G

Discussion Starter · #2 · Dec 5, 2003

Hi Anthony,

yes 8mm is corr

Hi Anthony,

yes 8mm is correct for the fuel lines.

on the 3 way valve, is it an electrovalve you are refering to?

Regards, JRV

G

Discussion Starter · #3 · Dec 5, 2003

Hi JRV,

The valve is purely

Hi JRV,

The valve is purely mechanical - it is bolted above the pass. rear wheel-well. The manual's description is pretty vague as to whether it is a unidirectional valve and there is not a one-way arrow on the valve in the fuel line schematic.

I have it hooked up the way it was from the factory, but after seeing the drawing, I am not sure what is right!?

Thank You,

Anthony

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G

Discussion Starter · #4 · Dec 5, 2003

I'll have a look at a nice

I'll have a look at a nice original 77 on Sat. and let you know what I see.

Regards, JRV

G

Discussion Starter · #5 · Dec 5, 2003

Thank you very much - that wou

Thank you very much - that would be fantastic!

Anthony

G

Discussion Starter · #6 · Dec 5, 2003

Hi Anthony,
I went through th

Hi Anthony,
I went through the same thing on my '78 and found a large exploded view of the valve somewhere. It showed the valve to be purely mechanical and operated by pressure or vacuum depending on fume direction.

Did you just purchase this valve or did it come with the car?. I tried to get one for mine but it didn't seem to be available or it was misidentified as an electrovalve. Never did find a 'good' part number for it.
DJ

G

Discussion Starter · #7 · Dec 5, 2003

Hi DJ,

The valve is origina

Hi DJ,

The valve is original and on the car. The car is all original and the evap lines were untouched, so for now, I am assuming the factory was right in the way it was hooked up and the drawings are incorrect. I have found other minor inconsistencies with the factory drawings also.

Where did you find the expolded view?

Thanks,

Anthony

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G

Discussion Starter · #8 · Dec 5, 2003

Spasso, Anthony

Ferrari UK

Spasso, Anthony

Ferrari UK has it on the owners site.

If you're not registered, do so. It will take a few days for the registration to go through (don't know why but it does). Log in and go the the parts/search area. Download the isoview program and install.

Put in your car model, year, fuel system, etc and search for valve. You'll find it, and an isometric drawing of the system and they have the valve. I want to say it was like $50 or more (no kidding).

Anthony, feel lucky you have the system attached. From what others have said, me included, it's been disabled on a lot of older 308's, and your car reeks of gas after shutdown as a result ( I have to leave the garage open for ~1hr to dissapate the fumes, but the smell is still there).

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G

Discussion Starter · #9 · Dec 5, 2003

Hi Sean,

Yes I have seen th

Hi Sean,

Yes I have seen the part on Ferrari's UK site, I just want to know how it works so I can determine if the factory install was correct(drawing wrong) or the drawing is correct.

Thanks,

Anthony

G

Discussion Starter · #10 · Dec 5, 2003

Photo coming tonight of an ori

Photo coming tonight of an original, never touched 77 valve as it came from the factory.

G

Discussion Starter · #11 · Dec 5, 2003

Thank you for your time, JRV.

Thank you for your time, JRV. I really appreciate it! Hmmm....now what happens if it is different from mine which is also untouched....Hmm : )

Thank You!
Anthony

G

Discussion Starter · #12 · Dec 6, 2003

Anthony,

are you reffering

Anthony,

are you reffering to this valve?

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G

Discussion Starter · #13 · Dec 6, 2003

1 more:

[IMG]http://www.fer

1 more:

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G

Discussion Starter · #14 · Dec 6, 2003

Or this ?

[IMG]http://www.f

Or this ?

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G

Discussion Starter · #15 · Dec 6, 2003

Hi JRV and thank you for the p

Hi JRV and thank you for the photos! The valve I am talking about is the one in photos 1 and 2 (white plastic).

When looking at photo 2, the RIGHT side of the valve should go to the bottom of the charcoal canister, correct? The LEFT side goes up to the rear of the engine compartment and connects to a check valve, I presume.

Thank you for your time in taking these photos - as always I am reminded what a great asset this site is!!!

Anthony

G

Discussion Starter · #16 · Dec 6, 2003

Hi Anthony,

you are correct

Hi Anthony,

you are correct. Left to check valve, right to cannister.

Glad to help.

Regards, JRV

G

Discussion Starter · #17 · Dec 6, 2003

Thanks again. I was amazed at

Thanks again. I was amazed at how well these evap lines stayed after 26 years. The beefy OD of these lines definitely contributed to this. It's too bad you can't find these anymore (only 12mm OD, I looked everywhere).

I replaced mine, but examining the insides of these lines revealed that they were not at all cracked. As hard as a hockey puck, but not that bad.

Considering they are fuel-related though, I went ahead and changed them to be safe.

Anthony

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