Fuel Vapor Line Size? - Alfa Romeo Bulletin Board & Forums
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post #1 of 9 (permalink) Old 12-23-2010, 09:29 PM Thread Starter
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Fuel Vapor Line Size?

Hi All,

There are 2 vapor lines that run from the charcoal canister in the wheel-well to the plenum/intake. One line is thinner than the other. Anyone know what size they are?

Whilst i'm replacing those is the same sized line used anywhere else on the vehicle?

Even better anyone have a nice complete list of vacuum/fuel line sizes?

(Want to replace with braided, not silicone)

thanks!

1985 Spider Veloce
Silver/Burgundy
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post #2 of 9 (permalink) Old 07-28-2019, 05:13 AM
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Hi! Ever get an answer to this? *Think* I'm looking for the same info (Just starting at fixing cars, fixing alfas and this bulletin board )
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post #3 of 9 (permalink) Old 07-28-2019, 07:00 AM
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Originally Posted by Lantheaume View Post
Hi! Ever get an answer to this? *Think* I'm looking for the same info (Just starting at fixing cars, fixing alfas and this bulletin board )
I could guess but I won't.
How about clipping a one inch piece from the end of each one and taking them with you to the parts store?

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
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post #4 of 9 (permalink) Old 07-28-2019, 01:03 PM
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Quote:
Originally Posted by Lantheaume View Post
Hi! Ever get an answer to this? *Think* I'm looking for the same info (Just starting at fixing cars, fixing alfas and this bulletin board )
I could guess but I won't.
How about clipping a one inch piece from the end of each one and taking them with you to the parts store?
Thanks for replying and good idea!

I would have taken the whole thing, but I’m having trouble getting it off. Didn’t want to put myself in a situation where I couldn’t drive it at all.
At the parts store I showed some photos and the guy there “figured” it was 5/16th. (around, I know it’s going to be in mm)
Also I think it’s the fuel return, not vapor after reviewing some schematics in the mechanics manual.
I’m going to try what he gave me and if *then* it’s wrong I’ll have the whole hose to bring in (and no Alfa to drive while I figure it out).

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* 1986 Spider Veloce *
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post #5 of 9 (permalink) Old 07-28-2019, 02:49 PM
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Quote:
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Quote:
Originally Posted by slowcreek View Post
Quote:
Originally Posted by Lantheaume View Post
Hi! Ever get an answer to this? *Think* I'm looking for the same info (Just starting at fixing cars, fixing alfas and this bulletin board )
I could guess but I won't.
How about clipping a one inch piece from the end of each one and taking them with you to the parts store?
Thanks for replying and good idea!

I would have taken the whole thing, but I’m having trouble getting it off. Didn’t want to put myself in a situation where I couldn’t drive it at all.
At the parts store I showed some photos and the guy there “figured” it was 5/16th. (around, I know it’s going to be in mm)
Also I think it’s the fuel return, not vapor after reviewing some schematics in the mechanics manual.
I’m going to try what he gave me and if *then* it’s wrong I’ll have the whole hose to bring in (and no Alfa to drive while I figure it out).
just remember that one of those hoses is bigger at the intake plenum side than at the canister.
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post #6 of 9 (permalink) Old 07-29-2019, 01:33 AM
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5/16" dia. fuel return hose sounds right.
(the OP was talking about the charcoal canister line, much smaller dia, but never mind!)

Fuel return hose is only a shortish length which then connects to a hard line back to the tank.
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Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #7 of 9 (permalink) Old 08-22-2019, 12:44 PM
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@SkiBum - Sorry for the late reply and thank you!
To be candid - not sure what the “plenum side” is yet. The 5/16 worked for the return hose in the trunk. (But did not solve my fuel smell issue <img src="http://www.alfabb.com/bb/forums/images/smilies/frown.gif" border="0" alt="" title="Frown" class="inlineimg" /> )
@Spidersere4 - it was 5/16! Thank you! Wanted to make sure I confirmed for anyone else doing the hunt I was on <img src="http://www.alfabb.com/bb/forums/images/smilies/smile.gif" border="0" alt="" title="Smilie" class="inlineimg" />. I did get it to connect to the hard line, tightened the clamps and car seems to run as well as it had. Still fuel smell tho.

Think I’m going to try the fuel feed line next. Bought one of those fuel vapor detectors and noticed that that line “beeped” more, but can’t reproduce consistently. (Maybe it’s a $25 detector issue rather then that line. )
It does crease a little when it comes off the fuel tank and under the carpet. Wondering if that’s part of the cause or it's just built that way. Seems strange setup.

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* 1986 Spider Veloce *

Last edited by Lantheaume; 08-23-2019 at 08:17 AM. Reason: Spelling truck > trunk
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post #8 of 9 (permalink) Old 08-22-2019, 01:17 PM
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@Lantheaume
what year spider do you have? (worth adding this to your signature)
Is fuel smell in the trunk? There is a whole fuel vapour system there behind the carpet flap (where jack is stored)....depends on year etc how it looks and what to check.

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #9 of 9 (permalink) Old 08-22-2019, 01:34 PM
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@Lantheaume
what year spider do you have? (worth adding this to your signature)
Is fuel smell in the trunk? There is a whole fuel vapour system there behind the carpet flap (where jack is stored)....depends on year etc how it looks and what to check.
It’s a 1986 Spider Veloce

Thank you - I saw that, but when I sniff around I thought I noticed it more near where the fuel comes in.
Was considering replacing the vapor lines too (which is why I was on this thread in the first place), but noticed more smell on the fuel feed and return hoses.

Recommend replacing them?

Thank you!

(Will update sig too. Ty!)
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