Expansion Tank Hoses and Charcoal Canister Hose

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KINGJOHN808
Posts: 127
Joined: Sat Feb 16, 2019 2:27 am
Location: Ewa Kai

Expansion Tank Hoses and Charcoal Canister Hose

Post by KINGJOHN808 »

Aloha all,

If you have never changed your expansion tank or charcoal canister hoses, take a good look at them. I kept getting the smell of fuel (faint but still there) in my trunk. After changing the fuel pump gasket, smell didn’t go away. That’s when I realized that the expansion tank with 4 hoses was in the trunk.

Ordered 11 feet of 6mm (ID) hose and set out to change from the fuel filler neck to the expansion tank. Glad I did this as the braiding was the only think keeping the hoses attached.

Entire process took about an hour because it was tough to get the factory hose clamps off without breaking the expansion valve tips (entire unit is made out of plastic). Also changed the fuel cap for good measure.

Moved onto the vapor line (8mm ID) between the hardline and charcoal canister. Same ordeal, original BMW hose clamps are a bitch to get off. Always had a strong smell of gas under the hood and finally figure out where it was coming from. Then”rubber hose” had hardened to almost plastic consistency. When trying to remove, just crumbled and fell apart.

Quick change and glad to announce that my trunk no longer smells of fuel nor the under the hood. Hoo Hoo!

So, if you haven’t checked, give them a tug or a wiff.

Good luck!
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Ewa Kai, Hawai’i
1984 633CSi
1983 633CSi (wreckers)

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KneeGrowNetwork
Posts: 12
Joined: Tue Nov 08, 2022 6:53 pm
Location: Atlanta

Re: Expansion Tank Hoses and Charcoal Canister Hose

Post by KneeGrowNetwork »

Where did you get your fuel lines and clamps from?
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86_6series
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Re: Expansion Tank Hoses and Charcoal Canister Hose

Post by 86_6series »

#'s 3 and 18 are what you would want. 6 & 8 mm hose.

https://www.realoem.com/bmw/enUS/showpa ... Id=16_0096

Do a search with those part #'s. Hose clamps to match @ your local parts store.
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KneeGrowNetwork
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Joined: Tue Nov 08, 2022 6:53 pm
Location: Atlanta

Re: Expansion Tank Hoses and Charcoal Canister Hose

Post by KneeGrowNetwork »

I was tryna find out if you used oem vent lines for number 3 or you just used fuel vent lines from an auto parts store. And did you go back with the factory clamps or the ones from an auto parts store.
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86_6series
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Re: Expansion Tank Hoses and Charcoal Canister Hose

Post by 86_6series »

Better to use new fuel lines and generic hose clamps.
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Ralph in Socal
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Re: Expansion Tank Hoses and Charcoal Canister Hose

Post by Ralph in Socal »

KneeGrowNetwork wrote: Fri Nov 11, 2022 3:13 pm I was tryna find out if you used oem vent lines for number 3 or you just used fuel vent lines from an auto parts store. And did you go back with the factory clamps or the ones from an auto parts store.
It's been a few years but I remember buying 6mm fuel hose (regular, not fuel injection rated) from a local auto parts store and using BMW worm drive clamps because I have an abundance of them. Since there's no real fuel flow under any type of pressure I would be comfortable with using any type of hose clamp.

Ralph
There is a very fine line between "Hobby" and Mental Illness.

85 635csi Zinno Auto
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