Fuel leak from "mystery" part

Looks like an evaporative collection canister. Is there any charcoal in it? Mail this to Daniel Pass (Ricambi America) and he will email you with the price and send you the part immediately.

From what is visible of the car, it looks great.

ken

 

Congratulations on your new beast mate!! Isnt that your carbon canister?? Im sure you can get a good boilermaker to solder/weld that back on for you. The carbon canister contains charcoal whichs absorbs fuel vapour fumes. Hope this helped? If it is the carbon canister on these 308's????? LOL Cheers

 

It's not a charcoal cannister. It's a vapor separator, that collects fuel vapor, alllows them to condense back to liquid form and return to the tank.

Brian

 

It's good to hear that the rubber lines were in good shape (usually these are dry-rotted and you get the same symptoms that you're having with some fuel sloshing out when full). There's an early US 308GT4 fuel evaporation control system shown on pages O14-O16 of the 308GT4 WSM and the system for a '79 US is the same as that shown on page 85 of the 150/78 308GTB/S US OM (download it from the Owners Site or Steve Jenkins' Ferrari site, etc.).

My reason for posting is to ask if the (open) tube on the top of your fuel liquid/vapor separator is connected to anything or not? You don't have to have a full blown working "US" type system, but if you're going to run a simple system that's just vented to atmosphere IMO it should still be reasonably "sealed" on the unwetted top end (e.g., it would be better to cap off the top of the liquid/vapor separator -- after you get a new one -- and run some type of vented fill cap). Anyway, please describe what you have vs. the system shown on 150/78 page 85 system if you'd like some suggestions.

 

Brian is right.

 

The vapor separator, as Brian said. #22 (Part #109843) on this diagram from the parts manual. Check with Daniel at Ricambi America.
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That diagram doesn't show the charcoal filter can.

It was added in 1977, IIRC, along with the opening solenoid and the driver's seat micro switch.....

Wouldn' t the solenoid be in the line venting this seperator you are talking about?

Dumping that fuel vapor laden air to atmosphere is asking for a visit from Mr. Sparky!!!

Without the solenoid I'd vent it via fuel line into the charcoal filter can.

Anyone have the complete 1979 diagram to show him what is missing?

 

That's the correct figure for the '78-'79 US 308GTB/S -- the charcoal canister is item 18. It shows the early 308 style canister shape -- the later '78-'79 charcoal canister is shaped a little differently, but they didn't bother updating the drawing precisely (this was "before CAD").

The difficulty with just connecting the open line to a charcoal canister and then letting the charcoal canister vent to atmosphere is that the charcoal will just saturate with vapors so it would still just look like an "open" line dumping out into the atmosphere. To run a closed system you need to have a way for the fuel vapors to be ingested back into the engine intake (without putting too big a vacuum and imploding the fuel tanks).

 

"Filter Vapor Combustible"

Yep, that's it! Thanks!

 

Hi Bubba,

That's from a 1978 parts catalog. The charcoal canister is the #18 & 21 combination.

My 1976 GTB has the driver's seat switch too, disconnected in my car.

Barry

 

Got it.......so only when "at rest" (seat empty) is the filter canister on line?

The rest of the time it's routed back to the intake??

*remembering*

Oh yea, if it isn't jumpered the fuel pump turns off when you get out....(???)

 

I have to rely on my high school and college Latin to read these parts manuals. Thank you, too, Steve. I think Spence will have an easy time of it when he gets home and checks this thread.

Barry

 

If you can get item 16 (the check valve) and the canister (item 18), you could hook those back up correctly using hoses 28, 17, 21, 51, and 52 (it isn't absolutely necessary to get the little blower motor item 56 -- you could just plug that port on canister 18 where tube 54 connects) -- check with Ricambi America, etc.. Otherwise, as I said earlier, I think it would be best to plug the top of the separator and find a vented filler cap (if such a thing exists).

Since this stuff has been removed what do you presently have connected to the metal vacuum tubes on the intake manifolds where hoses 51 and 52 normally connect? Are they just capped off?

The photo below shows the charcoal canister item 18 on my ex-78 US 308GTS to the right of the coolant expansion tank (i.e., yours must be missing if you can't easily find it):
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Yes, I had noted that the "fuel pump and pipes" diagram on the Owners Site given for the USA 77-80 308GTB/S was/is not quite right. The page that Barry posted matches my print copy of the 161/78 SPC (and my ex-'78 US version 308).

With regard to how necessary it is to reinstall this stuff, from a minimum safety viewpoint, I think you absolutely need to have a system that won't allow liquid fuel to directly run out if the car goes upside-down. I had a look at some of the Euro set-ups at the Owners Site that don't have any type of fuel evaporation control system (nor a fuel separator ) so you might be able to duplicate one of those configurations less expensively if the US parts 16 and 18 are no longer available.

 

FYI we have 6 new 109843 vapor separators in stock.
Brian
T.Rutlands/Maranello Auto Parts