Author Topic: While I'm waiting for the service manual can you tell me what this is?  (Read 145 times)

Offline Crow331

  • Posts: 37
  • Name: Dstorm
The car noob has a question and I'm still waiting for my service manual to show up :)

What is this? Right side in front of the radiator. The hose on the right in the picture is not connected anywhere and I can't figure out where it came off from. A diagram would be lovely!

Thanks all!


Offline Scot Minesinger

  • Posts: 4262
    • CLC Member
      CLC Member #20543
Re: While I'm waiting for the service manual can you tell me what this is?
« Reply #1 on: February 11, 2018, 07:02:50 PM »
Year, make and model?
Fairfax Station, VA  22039 (Washington DC Sub)
1970 Cadillac DeVille Convertible
1970 Cadillac Sedan DeVille
1970 four door Convertible w/Cadillac Warranty

Offline Crow331

  • Posts: 37
  • Name: Dstorm
Re: While I'm waiting for the service manual can you tell me what this is?
« Reply #2 on: February 11, 2018, 07:03:54 PM »
Sorry, 1974 Cadillac Eldorado

Offline TJ Hopland

  • Posts: 6941
Re: While I'm waiting for the service manual can you tell me what this is?
« Reply #3 on: February 11, 2018, 07:25:46 PM »
I don't remember the full official name but most people call it the charcoal canister.   Its an evaporative emissions device.   

Fuel tank is in theory sealed but has a 5/16 line from the tank to that canister.  Canister has some sort of charcoal media in it that is supposed to trap gas vapors.   When engine is running the hose to the carb is supposed to suck some air through the filter element in the bottom and pass the charcoal on the way drawing up those vapors along the way so they can be properly burnt rather than just escaping into the air.     

These were the earliest version of the system as time went on they added more lines and eventually solenoids to more precisely control them.    In the 90's they got the great idea to mount them behind the rear wheel.   No chance for any dirt to get in em there.   

Sometimes you can get gas in em if you really overfill the tank.   Either from gas or just age the 'bag' that holds the charcoal can fail and let the charcoal get sucked into the carb.   Quick fix for that was to install an inline fuel filter between the carb and canister.    IF you were thinking of eliminating it plug the carb end but note that the tank end is the only vent for the tank so it can't be plugged.
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
75 Eldo rusty but trusty
80 Eldo Diesel
And other assorted stuff I keep buying for some reason

 

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