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Old 24-07-2016   #16
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Re: Fuel Smell

Yup i don't think thereis anything high tech or a crucial need for the segregator, perhaps over doing the elf and safety with the effect of providing extra problems in the cars old age. SteveD
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Old 29-07-2016   #17
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Re: Fuel Smell

Thanks for this post, I'm suffering the same problem and plan to tackle it this weekend. In answer to some earlier questions as to the purpose of the Fuel Vapour Separator the manual I have states:
"Fuel vapour from the anti-rollover valves reach the separator located on the left rear wheel arch through two ducts. The separator consists of an outer case and closing several perforated plates on which a proportion of the fuel condenses. Condensed fuel returns to the tank three ducts, while vapours leave the central duct to the carbon filter. The two-way ventilation valve located near the charcoal filter allows vapour to flow back to the activated charcoal filter when the pressure in the tank causes the valve open. The valve also allows ventilation air coming from the activated charcoal filter connection to pass to the tank when the latter is under a slight vacuum."

The only part that worries me with this fix that "when the engine is running, the ECU turns on the carbon filter flushing solenoid (located near the charcoal filter). This allows vapour to be taken up by the engine in order to flush the carbon filter."

I'm wondering what effect the fix will have on that solenoid and the ECU and engine performance if it is just passing air through. Am I sounding paranoid?
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Old 29-07-2016   #18
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Re: Fuel Smell

Many thanks, I'm not entirely clear on some of that but it sounds a bit like what I suggested a few posts ago as regards what the segregator does. A bit. To be honest I'm happier with my setup whereby both the segregator and the front canister are isolated and no longer do anything.

I've been driving with the canister isolated for months and it's been running perfectly. Isolating it involved disconnecting the pipe that takes vapour to the canister, at the click-together connector which is just beneath where that pipe goes down through the floor next to the tank and emerges beneath the car, and running a new length of pipe rearward from that connector so that the vapour exits beneath the rear bumper. And under the bonnet I snipped the blue pipe that runs between the intake manifold and the canister and plugged both ends, to isolate the 'out' side of the canister.

And of course isolating the segregator is described above. I've been driving daily with that isolated for a couple of weeks now and again all has been fine. Absolutely no fuel smells even with a full tank, and no pressure build up in the tank. Previously, the smell would be there randomly, on and off just about every day, both in the cabin and boot (there's a passageway between the tank area and the boot, through which the aerial wiring runs, so I assume the smell gets to the boot through there. You'll see it once the bulkhead is out. Oh and you may want to check the inner arches for rust while it's out, mine were fine thankfully).

My setup may be overkill as I don't see how liquid fuel could emerge from the valves on top of the tank in sufficient quantity to reach the canister at the other end of the car, unless perhaps the car rolled over but if those are anti roll-over valves as described in the extract then presumably they close if the car inverts anyway (or should do). I hope you have success, please update to say how you get on !
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Old 10-08-2016   #19
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Re: Fuel Smell

Well, I finally found the source of my fuel smell problem and it wasn't what Cribus had found and solved. When I got to the tank (following the excellent instructions in this post) i noticed fuel leaking from around the pump seal. One very clever previous owner (or mechanic) replaced the fuel pump in the tank but didn't seat the pump squarely on the seal so it was crimped in one spot. They subsequently overtightened one of the stud bolts that hold the pump in place and snapped it off. So I had no seal and one stud missing, hence the over-powering smell - let alone danger.

Quickest solution was to get a tank from Henk at Barchettaparts. It was Godsend and came complete so all I had to do was take out the old one living all the hoses in place and reconnect them. Lucky for me the pump in it worked fine and now I have a spare. Best part is the smell is gone and I haven't had to terminate any of the hoses or use Cribus' suggestion.

Just one thing I did notice. The segregator canister that Cribus disconnected is a sealed unit and I can't for the life of me figure how any vapour could escape from it unless it was cracked or the connectors weren't on tightly. It's a mystery.
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Last edited by tpoulos; 10-08-2016 at 16:33.
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Old 10-08-2016   #20
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Re: Fuel Smell

Glad to hear your smell is sorted, I don't envy you changing the tank. It just goes to show that no two cars are the same I suppose. The fuel pump seal was one of the first things I checked on mine but all the tank connections and seals, pipes, clips etc were dry as a bone.

Maybe my smell was coming from one of the pipe connections to or from the segregator rather than from the unit itself but I didn't get to examine it closely as I couldn't even work out how to detach it to have a look over it. I've been using my car daily for weeks now and there's not even a hint of petrol smell in either cabin or boot whereas before it was a daily issue.

I'd be interested to hear how others get on, I went right round the houses for months tracking down the cause of the smell in my car.
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Old 10-08-2016   #21
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Re: Fuel Smell

I am going to have a look at the end of September when I take the car off the road. Thanks for the really good thread and particularly the advice for the bulkhead removal. Steve
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Old 11-03-2017   #22
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Re: Fuel Smell

Hi, im experiencing a lot of fuel smell in my cabin and trunk, opened it up and everything looks perfect. Smell is coming from near the Fuel Vapour Separator so i was also thinking of solving it like you did. Thats how i found this forum. Now my question is: do i have to isolate it completely? Can I leave all but one tubes attached? If not: how did you create the T, does this not cause pressure problems? And what to do with the one that goes to the charcoal unit? Grtz and thanks
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Old 12-03-2017   #23
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Re: Fuel Smell

Hi

Best way I can describe what I did is that the two pipes which take fuel vapour from the valves on the top of the tank now go to the T-piece I mentioned, and a third pipe then leads from the T-piece down through the floor to the junction/union under the floor which then takes the vapour to the charcoal canister. Obviously there was more detail in the earlier posts. The original pipes going to and from the segregator are all sealed so that the unit is isolated. It's probably not crucial to isolate the segregator permanently as once whatever's in there has evaporated, it won't create any more smells as it's no longer connected to the tank but sealing it gives you an immediate idea whether the job has worked or not (given that there seem to be multiple causes of the fuel smell).

There's no pressure issue as the fuel vapour from both valves meets up at the T-piece and then goes to the charcoal unit.

As I mentioned earlier, all I needed to create the new vapour circuit was some black fuel pipe (6mm inner diameter to push on to the exiting blue pipes which I snipped) and the plastic T-piece. Since doing the job last summer I've had no fuel smells at all.

Apologies if I'm missing the point you're querying, let me know how you get on !
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Old 22-03-2017   #24
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Re: Fuel Smell

I read your original post again and see now where I got confused. So you lead the last part to the charcoal unit, I've misread that because at first you lead it to the exterior behind the car.
This last one was my idea actually. So now I'm stuck with the question: should I best connect the 2 in a T part and lead this to the exterior (or if I lead it to the exterior is the T part even necessary..) sealing off the charcoal unit and the segregator as well;
or do the same thing but lead it to the charcoal unit like you did. What would be the best choice, why did you choose to connect it?...

I tought that if leading it to the charcoal unit this would be a hazard. I can't imagine that the segregator had no function at all... If you lead the pipes directly to the charcoal unit will there not be a chance of pressure problems/Gas going directly in the charcoal unit; and thus creating a fire hazard. ? In my opinion it would be best to lead them to the exterior but I don't know the car very well I've had it for weeks..
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Old 23-03-2017   #25
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Re: Fuel Smell

Hi, As I mentioned in my earlier posts, by the time I realised that the segregator was probably the cause of the smell in my car, I had already disconnected and isolated the charcoal unit in case that was the cause (some earlier posts by others had suggested that). So in my case, I was always going to vent the fuel vapour to atmosphere at the rear of the vehicle rather than run it to the charcoal canister. But in my earlier posts I included the fact that others would probably rather send the vapour forwards to the canister if theirs was still connected and active, which is where the confusion may have been caused!

The only reason I used a T-piece was because there are two vent pipes leading from the top of the tank, and only one hole in the floor through which the original pipe from the segregator passed on its way forwards to the canister. So rather than create a second hole it seemed simplest to just connect the two pipes together and then have a third leading to the hole in the floor.

I suppose there could be pressure problems with the charcoal canister if the system which controls the way in which vapour is released intermittently from the canister into the intake manifold no longer works properly. Again I remember seeing earlier posts saying that can be the case. If you do decide to seal off the canister, obviously the blue pipe connecting it to the manifold needs to be snipped and each end plugged. Personally I'm happier having the tank vapour venting to atmosphere at the rear underside of the vehicle, in case the absence of the segregator does in some way affect the canister (given it's so close to a hot engine and the fuel supply line, what could possibly go wrong?!!) Having done it my way, I've had no issues at all since doing the job last summer.

I do have to emphasise that I'm not a mechanic and this was part of a trial and error process aimed at tracking down the cause of the smell (yes that was a disclaimer!) But if I was tackling it again I would still isolate both the canister and the segregator and run the vapour to the rear underside. It may not be very green but I've been beneath the rear of the car several times since doing the job and I've never noticed any fuel smell, so I doubt the impact is that great. Just don't light a fag whilst changing your rear offside shock ! Anyway I hope that helps.
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Last edited by Cribus; 23-03-2017 at 00:41.
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Old 23-03-2017   #26
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Re: Fuel Smell

Thanks man very very useful info. I'm gonna seal off both and pull it towards the rear as well, seemed to be the right choice in the first place.
No longer shall the Misses her purse smell like fuel every time she leaves it in the car. (because for me honestly I even like the smell, does make me dizzy sometimes so that can't be good... )

Anyways thanks a lot, see you around grtz
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Last edited by Animalino; 23-03-2017 at 09:39.
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Old 24-03-2017   #27
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Re: Fuel Smell

No problem, good luck with that. My other half always used to complain about the smell as well, she hates the car and would love me to sell it so I've made it my life's mission to fix every noise / smell she complains about, just to be annoying.
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Old 26-06-2017   #28
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Re: Fuel Smell

Hi, I want to change the two gasket seals on my fuel tank the pressure vent points numbered 9 on the eper drawings for fuel tank. Hopefully somene has done this before and can advise me. My questions are,
Can I do this with the tank insitue, there appears to be enough headroom from memmory.
How do the vents detatch from the tank to enable the gasket to be changed?
The seals are available from Italy at 15euros each plus postage.
Any advice or how to's will be very welcome.
SteveD
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Old 26-06-2017   #29
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Re: Fuel Smell

Sorry, thankfully I didn't have to tackle that as part of the work I did. Looks like a cramped area to work in.
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Old 27-06-2017   #30
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Re: Fuel Smell

Yup not a lot of height in there. Anyone else worked on these?
Cheers
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