A small hole in fuel filler neck.

[Johan.s]

Hi,

I have a really persistent fuel smell in my 1978 SC which I’m unable to resolve. The car has gone through a complete restoration so all fuel lines etc have been replaced.

When I pressurised the fuel tank through the fuel tank ventilation outlet I noticed that air was coming out of a hole in filler neck. This hole looks like it is supposed to be there. On the inside of the filler neck there is a tab covering the hole. My guess is that it is closed by the fuel cap and open when the fuel cap is not in place and putting pressure on the tab. Mine is leaking even if the fuel cap is in place though.

Can anyone confirm if this hole really is supposed to be there and if so how does it work?

Sorry about the rather poor pictures, difficult angle to get a good shot.

Thanks!

[Mark Salvetti]

I think you are missing the plate with the hole for the fuel nozzle. Does it look like there was a weld on the opposite side?

Here is my 1979 fuel filler. The little door is spring loaded. I'm guessing your bracket would be visible below my plate if I were to remove it. Not sure what the bracket would do - maybe a stop for the little door?

I think the hole you have is not supposed to be there, but instead is where your missing plate was welded to the filler neck.



Mark

[Johan.s]

Great! Thanks a lot!

I should try to seal that hole then.

[GH85Carrera]

The simple fix is likely a little sanding to clean up the spot and some JB weld on the spot. Replacing that entire filler neck is not real hard if you can find one for a reasonable price.

[Johan.s]

I will probably try JB weld to seal the filler neck temporarily and continue to try to find the sources for the fuel smell. Then I can remove the filler neck later on and weld it properly.

[Mark Salvetti]

I suppose it's possible someone in the past knocked out the little plate. I think it is meant to prevent the insertion of a leaded gas nozzle, which is larger than an unleaded gas nozzle.

Mark

[Johan.s]

Yes most likely. It’s originally a US car that was brought to Europe. It has passed through a couple of uncommitted owners who did a lot of questionable things to the car.

[Bigtoe32067]

JB Weld
I put that sh t on everything!

[Pinoy911SC]

Did you find the source of the fuel smell? I’m noticing the same lately in my 79SC. Like a leak somewhere. It not anywhere near the engine so I’m thinking towards the front of the car.

[James Brown]

mine leaked (81 sc) around the rubber grommet where it entered through the fender, I THINK i found a replacement for the filler neck made out of stainless steel on this site. that fixed the problem for good.

[Johan.s]

I managed to get most of the smell away! (Yay! I can finally drive the car without getting dizzy)

What I've done:
- I sealed the filler neck whole with JB weld.
- I found a tiny leak and needed to tighten a hose clamp on the hose that takes the gasoline fumes from the front of the car back to the charcoal canister.
- I replaced the active coal in the charcoal canister.

[Mark Salvetti]

Originally Posted by Johan.s

I managed to get most of the smell away! (Yay! I can finally drive the car without getting dizzy)

What I've done:
- I sealed the filler neck whole with JB weld.
- I found a tiny leak and needed to tighten a hose clamp on the hose that takes the gasoline fumes from the front of the car back to the charcoal canister.
- I replaced the active coal in the charcoal canister.

The charcoal in the canister near the oil fill? I've wondered about that. Does the lid pop off, and then you just replace it with aquarium charcoal?

Mark

[Johan.s]

Yes it is just forward of the oil fill on my 78 SC. The lid has some tabs that you can carefully pry with a screwdriver. I used what was labeled as universal active coal for kitchen fans, aquariums etc

[ClickClickBoom]

Originally Posted by Johan.s

I will probably try JB weld to seal the filler neck temporarily and continue to try to find the sources for the fuel smell. Then I can remove the filler neck later on and weld it properly.

JB will fail in short order, there are epoxies for petroleum applications:

https://www.amazon.com/OylTite-Stik-Leaks-Repair-Sealant-Stick/dp/B002C3L5NO

http://12.133.121.166/prod/47/oyltite-stik.aspx

Buddy used this on an Audi that his wife hit a parking stop with the oil pan cracking it. 5 years later it was holding fast.