Why does the inside of my car smell like gas?

[dipso]

Ever since I put on my PMOs the inside of my car smells like gas after it sits for a few days.
There are no leaks underneath. I haven't checked the tunnel but I am pretty sure there are no gas leaks in there. I didn't change those hard lines, but did change all the others.
I relocated a Holley Red pump to the smugglers box and there are no leaks in there either.

As soon as I roll down the windows and drive for a bit, the smell is gone. It doesn't come back either, until I park and let the car sit for some time.
I know the float bowls are exposed through the stacks and filters, but how does the smell get inside the cab all the time? The garage doesn't stink like gas and the rear of the car doesn't stink like gas.
Is there some passageway from the engine bay to the cab that I need to plug?

I did remove the emissions canister from the engine bay and the line that ran to it. And disconnected the other end at the filler neck.
Do you think it is just fumes coming from the tank, at the disconnected line at the filler neck. Or something more sinister.
Isn't there some kind of breather or check valve that I can put on the filler neck nipple to only let air in and not fuel odors out?

Or is this the way it is supposed to smell?
I don't like it.

[Packy]

Quit farting, duh.

[ossiblue]

You tinkered with the vapor recovery system and that's where the fumes are from, IMO.

[dipso]

Hmmmm, I just went out and checked and it looks like the line at the filler neck that I disconnected is just some kind of overflow line that goes into the trunk and then routes back out to drain out the fender well.
It looks like it is unnecessary.
Also, there is another metal overflow thing, shaped like a U in the upper part of the filler neck beneath the rubber gas cap surround.
I don't think either of these are the culprit, because they have always been there.

Where does the other end of the line from the engine bay go to? The one that was connected to the evaporation canister.
I just cut that one off underneath the car as it exits the tunnel.
Should I cap that? Or find where it goes and plug it up there.
I am curious now. Where does that line terminate?

[dipso]

Originally Posted by ossiblue

You tinkered with the vapor recovery system and that's where the fumes are from, IMO.

Yeah, maybe. But, I think I removed the canister long before the smell arrived.
The smell only came with the carbs.
I can't see how hooking up the crank case breather hoses to the filter covers would stop the fuel smell.
If the fuel is coming from inside the carbs it would smell up the engine bay through the filters. Right?

[porschenut]

I've read many cases where guys took out the evap emissions canister and they ended up with fuel smell in the car. Quick check - put yours back on and see if it goes away.

Also do a search on the issue and you'll find tons of threads.

[dipso]

Originally Posted by porschenut

I've read many cases where guys took out the evap emissions canister and they ended up with fuel smell in the car. Quick check - put yours back on and see if it goes away.

Also do a search on the issue and you'll find tons of threads.

Don't have it. I'll have to plug the hose.

[TimT]

Something else is going on that is letting the fuel smell into the cabin..

I have had carbed 911s and 914s for years that have not had the vapor recovery systems intact and not had issues with smelling gas in the cabin..

[peehonix]

Check seal under gas cap. Replace if need be.

[80-911SC]

I thought they all did ........

[dipso]

Originally Posted by TimT

Something else is going on that is letting the fuel smell into the cabin..

I have had carbed 911s and 914s for years that have not had the vapor recovery systems intact and not had issues with smelling gas in the cabin..

Here is what I am thinking.
I just searched a bunch of threads and there are lots of diagrams. Mostly hoses that go from the charcoal canister in the rear (gone) to the expansion chamber up front (don't know if i have that or not) then to the tank and all around the place.

I would like to take the hose that connects to the tank ( I haven't looked yet) and I assume goes to the expansion chamber and then to the charcoal canister (or vice versa), remove and cap that hose.
End up with no charcoal canister( already gone), no expansion tank ( might already be gone), and just have my tank vent and breath through the overflow connection at the filler neck.
Nice and simple with no hoses or equipment anywhere.

Would that work?

[dipso]

I think I see it. I just went and looked and opened my trunk. The smell is awful in there.
Double checked the pump in the smugglers box and no leak.
What I did notice though is that there is a large hose coming from the top of the tank that connects to a clear hose that goes through the fender well, connects to one of those cloth covered hoses and then connects to a nipple on the filler neck.
That was disconnected.
So it seems my tank was just venting through that hose, getting into the trunk and getting into the cab.
I will put a clamp on that and affix it tomorrow.

I am still wondering where the other end of the hose that used to connect to the charcoal canister goes.
Is that an open fuel odor source?
Perhaps I should put a golf tee and a clamp on that end as well.

[ossiblue]

Originally Posted by dipso

I think I see it. I just went and looked and opened my trunk. The smell is awful in there.
Double checked the pump in the smugglers box and no leak.
What I did notice though is that there is a large hose coming from the top of the tank that connects to a clear hose that goes through the fender well, connects to one of those cloth covered hoses and then connects to a nipple on the filler neck.
That was disconnected.
So it seems my tank was just venting through that hose, getting into the trunk and getting into the cab.
I will put a clamp on that and affix it tomorrow.

I am still wondering where the other end of the hose that used to connect to the charcoal canister goes.
Is that an open fuel odor source?
Perhaps I should put a golf tee and a clamp on that end as well.

The hose that connected to the charcoal canister used to come from an evaporation tank located in the front, left fender just behind the head light bucket. Not sure on your year car, but if you look closely by your battery, on the wheel well sidewall, you'll see a connector through the sheet metal where the hose should go. At least, see if you have the collection tank behind the head light bucket.

[dipso]

Here is the diagram I am going to use. I figure 3,4,5,6 and 7 are no longer needed.
3 and 7 are gone anyways.
I'll look for 2 but I don't think I have it.

3 is the charcoal canister and 2 is the expansion chamber.
If I remember correctly the line from 3 went from the rear of the car into the tunnel. My canister was in the rear. I just cut the line before it went into the tunnel and put a screw in it as a plug.

If the line between 2 and 3 is capped , doesn't that make 2 non functional?
Could I just remove everything including 8 and 2 and only keep the line between the filler neck and gas tank?

[dipso]

Just looked and nothing behind the headlight bucket except a bracket where one used to be, I assume.

It looks like this thing is plumbed just as I described above already. Interesting.

I think I will just replace all the hoses.
But like I said originally. This odor didn't start until I put on the carbs.

Very strange.

[RWebb]

any charcoal canister from any vehicle will work

you will be a lot better off by plumbing the original system with new hoses and restoring it back to how it was before; i.e. how the engineers designed it

[Jesset100]

[dipso]

Damn Jesset, that is one complicated system there.

Mine is like the simpler CIS system above.
I only have #1. None of that other stuff is there.
2,3,4,5,6,7,8, are all gone.