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Gas Leak
#1
Hello,

1973 Mustang ... filling up with gas today when I got near full(auto cutoff on gas pump) a small amount of gas dripped out onto the ground from under the bumper rear valance. Not out of the gas filler opening. An suggestions as to what might be wrong ? Also, I notice that I have the gas vapor recovery system under the hood ... think it is a charcoal canister of some type. Is there any maintenance or issues to look for with that ? Sometimes I get a faint gas odor from under the hood. I know the 2v carb needs rebuilding. There are no leaks from the carb. thanks

Steve
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#2
Tanks will usually leak from the filler tube joint, the welded seam (rust), or between the straps and tank (rust).

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#3
MotoArts;197869 Wrote:Tanks will usually leak from the filler tube joint, the welded seam (rust), or between the straps and tank (rust).

Thanks for the reply
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#4
From the location of the leak and because the tank was nearly full I would suspect the donut seal between the filler neck and tank.

There's really nothing you can do with the charcoal canister, just make sure the tube is connected from it to the air cleaner and the hoses and steel tube between it and the gas tank aren't rotted or rusted. Because the top of the carburetor fuel bowl is vented it's not uncommon to get a whiff of gas odor occasionally.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
I suspect the donut gasket also. You can check it by removing four sheet metal screws securing the filler tube dust cover. It is attached to the trunk floor. You well have to raise it off the trunk floor and observe the donut gasket seal in action while full or filling. I suspect that it only leaks when fuel is up to the filler neck. It probably won't leak unless it's full.
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#6
judge;197893 Wrote:I suspect the donut gasket also. You can check it by removing four sheet metal screws securing the filler tube dust cover. It is attached to the trunk floor. You well have to raise it off the trunk floor and observe the donut gasket seal in action while full or filling. I suspect that it only leaks when fuel is up to the filler neck. It probably won't leak unless it's full.


Thanks very much

Don C;197891 Wrote:From the location of the leak and because the tank was nearly full I would suspect the donut seal between the filler neck and tank.

There's really nothing you can do with the charcoal canister, just make sure the tube is connected from it to the air cleaner and the hoses and steel tube between it and the gas tank aren't rotted or rusted. Because the top of the carburetor fuel bowl is vented it's not uncommon to get a whiff of gas odor occasionally.

Thanks !
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#7
.

Don C;197891 Wrote:From the location of the leak and because the tank was nearly full I would suspect the donut seal between the filler neck and tank.

There's really nothing you can do with the charcoal canister, just make sure the tube is connected from it to the air cleaner and the hoses and steel tube between it and the gas tank aren't rotted or rusted. Because the top of the carburetor fuel bowl is vented it's not uncommon to get a whiff of gas odor occasionally.

Tell me about this charcoal canister? I sometimes have a gas smell, but it usually comes from the front of the car and there's no gas leak. The 2 barrel carb was rebuilt last year and recently was adjusted as it was running rich.

[/url][Image: mbpsrsig3_zps456db2cb.png]

[url=http://s165.photobucket.com/user/MPBsr25/media/mbpsrsig3_zps456db2cb.png.html]
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#8
The gas tank is vented through the charcoal canister and the fuel vapors are pulled out of the canister into the air filter and burned when the engine is running. Any openings in the hose or tubes allows the gas vapors to escape. The canister sets between the wheel well and firewall on the passenger side.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#9
Don C;197918 Wrote:The gas tank is vented through the charcoal canister and the fuel vapors are pulled out of the canister into the air filter and burned when the engine is running. Any openings in the hose or tubes allows the gas vapors to escape. The canister sets between the wheel well and firewall on the passenger side.

Any chance of a pic of what it looks like?

Does the canister need to be changed after 40 some odd years?

Thanks

[/url][Image: mbpsrsig3_zps456db2cb.png]

[url=http://s165.photobucket.com/user/MPBsr25/media/mbpsrsig3_zps456db2cb.png.html]
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#10
naa10104,

Yes, Pictures if available!

Here is a picture form the Ford Master Parts Catalog that might help in determining leak.

D1ZZ-9072- A 2.17'' I.D> - 3.30" O.D.

[Image: qpnmzt.jpg]

Source: Ford Master Parts , Copyright May, 1975

mustang7173
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