 No expansion tank and no charcoal canister, Does this mean gas fumes entering the cabin? |
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| MM1 |
 Mar 31 2022, 08:07 PM
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#1
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914 obsession continues  Group: Members Posts: 608 Joined: 9-May 18 From: Thousand Oaks, CA Member No.: 22,105 Region Association: Southern California 
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My latest carbureted project has no expansion tank or charcoal canister .
Does this necessarily mean that I will smell fumes entering the cabin while sitting at a stoplight or driving ? |
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Replies(20 - 22)
| Biggles |
Apr 4 2022, 09:49 AM
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#21
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Member Group: Members Posts: 191 Joined: 5-September 13 From: UK Member No.: 16,353 Region Association: England |
QUOTE(Steve @ Apr 4 2022, 03:45 PM)  QUOTE(Biggles @ Apr 4 2022, 07:03 AM) QUOTE(Steve @ Apr 1 2022, 04:37 PM) I think it all depends on your setup. When I had carbs with one feed line, I didn’t notice it. After installing the 3.2 with injection and return line, it was really horrible. I installed a charcoal canister in front of the battery tray, stock expansion chamber on tank and no more vapors. Thats interesting Steve. I have the same 3.2 on injection and after a while it stinks but i dont have the expansion tank and charcoal filter as i thought it was more weight i didnt need ! The seals to my tank are new and pipes are all ok so where could it be coming from? Where do you suspect it was coming from in your car? If you don’t have an expansion tank and charcoal canister, best practice is to run the tank vent under the car. The vapors still managed to get inside the car and in the garage which annoyed my wife and kids. No more vapors after installing the expansion tank and charcoal canister. With these devices installed it is a closed system. Got it. Cheers. |
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| mlindner |
Apr 4 2022, 10:13 AM
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#22
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Senior Member Group: Members Posts: 1,528 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
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I had a bad fuel smell last year when build was done. My fuel tank setup just has the vent hose (center under fuel cap) go down to outside of car. Little later I found a leaking hose clamp on the fuel pump, fix that and the smell is gone. Again this is with 40 PMO's with fuel line in only, no return. Best, Mark
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| aturboman |
Apr 4 2022, 02:27 PM
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#23
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Member Group: Members Posts: 135 Joined: 18-October 11 From: CA Member No.: 13,687 Region Association: None |
This is a stock 914-6 Euro set up without a charcoal canister
With a full tank and hot day in the garage you can smell some fumes but very minimal The plastic tee on the overflow pipe is only on Euro cars or very early US cars.  |
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