Strange hose now dangling - Alfa Romeo Bulletin Board & Forums
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post #1 of 10 (permalink) Old 01-07-2019, 12:40 PM Thread Starter
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Strange hose now dangling

There’s a strange little hose dangling from my 1969 Roundtail Spider. It appears to originate in a filter or vapor expansion thing in my trunk. It’s circled in the first picture. The hose then travels down under the car and currently rests on the ground. See photos. What is it and where should it go?

Confused,
Roger
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post #2 of 10 (permalink) Old 01-07-2019, 01:29 PM
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not sure on your particular model year, but my 'guess' is that green vinyl hose (no. 16 in diagram) should be connected to the small hard tube (no. 17 in diagram) running along the side of the cam cover.....if your spica set up has that hard tube??

simplified diagram here (from a '71)
https://www.alfabb.com/bb/forums/913478-post10.html

if you don't have that hard tube on your 69, then maybe it just dangles.......odd though, and certainly wouldn't hang down, rubbing on the street like that

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 #3 of 10 (permalink) Old 01-07-2019, 01:37 PM
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Looks like a gas vapor exhaust? So you don't get the gas smell in the car. May be wrong?

AlfasRule!

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post #4 of 10 (permalink) Old 01-07-2019, 01:58 PM Thread Starter
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Wonderful diagram! Interestingly, the car was converted to carbs decades ago (I’ve owned it since ‘91). I wonder if it’s been tucked somewhere inconspicuous all those years!

Only slightly less confused but quite appreciative,
Roger
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post #5 of 10 (permalink) Old 01-07-2019, 03:04 PM
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It a vent tube. It's supposed to run along the inside bottom edge of the quarter panel. You car is missing the bits that hold it in place.

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post #6 of 10 (permalink) Old 01-07-2019, 05:33 PM
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In my '71 the vapor line runs alongside the fuel send and return lines.

[FONT="Century Gothic"][B]Bob Farace[/B]
[COLOR="DarkGreen"]1971 Alfa Romeo 1750 Spider Veloce[/COLOR]
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post #7 of 10 (permalink) Old 01-08-2019, 05:28 AM
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Quote:
Originally Posted by Farace View Post
In my '71 the vapor line runs alongside the fuel send and return lines.
Bob, on the 69 model year, the vapor was vented at the rear of the car. For the 71 cars, the vapor was returned to the crank case.
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post #8 of 10 (permalink) Old 01-08-2019, 07:38 AM Thread Starter
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Well, this seems to be the solution! I will tuck the tube into that seam along the inside bottom edge of the quarterpanel leading to the rear of the car where it will simply vent into the atmosphere. I may have to be a little creative to ensure it’s properly secured.

Sincere thanks to all the gurus,
Roger

PS: Here’s a view of the rest of the car
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post #9 of 10 (permalink) Old 01-08-2019, 10:05 AM
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Quote:
Originally Posted by ossodiseppia View Post
Bob, on the 69 model year, the vapor was vented at the rear of the car. For the 71 cars, the vapor was returned to the crank case.
Thank you, I didn't know that. So I assume the earlier cars don't have that hard line along the edge of the cam cover then?

Alfa changed so many things over the years, almost on a whim at times, that I never take what I find on my car to be gospel for anything (especially when previous owners are added into the mix), and it's just presented as a data point.

[FONT="Century Gothic"][B]Bob Farace[/B]
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post #10 of 10 (permalink) Old 01-08-2019, 10:41 AM
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Quote:
Originally Posted by Farace View Post
Thank you, I didn't know that. So I assume the earlier cars don't have that hard line along the edge of the cam cover then?

Alfa changed so many things over the years, almost on a whim at times, that I never take what I find on my car to be gospel for anything (especially when previous owners are added into the mix), and it's just presented as a data point.
That's right. The tube is not on the 69 model year cars. Venting gas fumes to the atmosphere was common practice. I think the change to venting to the crank case was an EPA thing.

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