Lotus Elan

Securing fuel tank breather pipe to roof.

PostPost by: gus » Fri Jan 26, 2018 1:24 pm

Again, no reason to go across the roof, it works fine just over the c pillar vent, and everything remains easy to access if any maintenance is required

A side question, when adding the vent line to the filler neck, does it radically improve the filling efficiency?

I guess I have got used to pulling the nozzle out, holding back the vapor recovery snorkle and finishing the fill.
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PostPost by: TeeJay » Sat Jan 27, 2018 11:03 am

Some of the Key points of the ?Club Lotus? modified breather.

When tank is filled, air is expelled at a high rate via the big bore tubing connected to the filler neck.

The reason for the breather tube still going to roof height is to help eliminate fuel discharge via the tubes. Much lower tubing can still spill out fuel, particularly when travelling around fast sharp corners with a full tank of fuel.
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PostPost by: alan.barker » Sat Jan 27, 2018 11:11 am

+1 the breather tube still needs to go up and over the top :wink:
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PostPost by: gus » Sat Jan 27, 2018 1:11 pm

Baloney


It never happens

and shall we wonder how the convertible conversions fare?

the angle at which the car would have to tip in order to spill fuel would mean it is on its side
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PostPost by: Bigbaldybloke » Sun Jan 28, 2018 1:51 am

Tee Jay
How have you secured the tapping point into the fuel filler neck please, how have you sealed around it, do you have something securing it attached inside the filler neck?

I?m thinking I?ll need some sort of screwed boss brazed inside the filler neck.

Cheers
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PostPost by: TeeJay » Sun Jan 28, 2018 12:31 pm

Simon, you?ve got it in one.

Yes a tapped boss shaped and brazed to the inside.
My picture shows the initial setup, which I had tapped the filler neck.
It is import to position the filler neck so that the fuel cap is in the correct position and then position the hose connector. The boss was then brazed to the filler neck.

For further information, the photo shows the yellow (earth wire), which I used to route and measure the tubing which goes over the roof and out into the RH rear wheel arch. All being part of the revised breather system.

fuel-filler-vent.jpg and
breather-hose-route.jpg and

As I fitted a new roof lining, it was an easy decision to route the hose in the roof as recommend.
I had spent many months scraping the paint off the body, then used fibre glass matt to reinforce the know weak areas of the body, then tissue for repairs. Then a long protracted spraying of the several layers of paint. There was no way I would risk a breather system which could result in petrol spills.
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PostPost by: Bigbaldybloke » Mon Jan 29, 2018 5:40 pm

Thanks for those pictures, most helpful. Plan decided, just need to obtain the necessary fittings and get on with it.
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PostPost by: DavidLB » Tue Jan 30, 2018 4:47 pm

I have a system as tea jays been done about three years or so and works fine no smell and with the mx5 bit no overflow from the filler cap
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PostPost by: Donels » Thu Oct 03, 2019 6:53 pm

BBB this is how I did my filler neck mod using standard but modified plumbing fittings and sealant. The breathers needs to be removable to fit the filler neck through the body.

df7ba2fb-51aa-430d-aacf-08f79ffd12b4.jpeg and


873f0f41-c6f7-40e2-a9f7-b73e9d3b15fb.jpeg and
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PostPost by: Bigbaldybloke » Thu Oct 03, 2019 8:26 pm

Hi all, I used all the info everyone provided and came to a similar solution using slightly different parts but to the same effect. It?s actually two parts machined and brazed together to form the boss that was then brazed into the filler neck and the third part screwed into that once the filler neck was in the car. I haven?t fitted the breather pipes over the roof, I?ve gone for breather valves and a pipe that goes up the rear pillar and then back down into the same side wheel arch. I?ve posted pictures in another thread but can repost here if anyone is interested.
Attachments
4452ef07-d791-419d-92e4-b1c0ad226f19.jpeg and
018c34c1-52e3-4d8b-b4da-7f55a2adf94b.jpeg and
1c9aafca-894a-4cf8-8ebc-a64125317093.jpeg and
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PostPost by: Andiken » Tue Nov 17, 2020 10:25 am

Hi all

I'm just in the process of installing the breather mod discussed here, I've sorted the breather into the filler neck and the big bore breather hoses but have a question regarding the small bore vent pipe. What bore is required for this please? I'm looking at taking it up the C post and then back down again through the original exit hole.

Thanks
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PostPost by: alanr » Tue Nov 17, 2020 1:55 pm

I don't believe the bore size needs to be all that large.
Having done the filler pipe mod and the MX-5 one way valve mod I retained the original breather pipes on the car due to not wanting to disturb the headlining. I just blocked one off completely and then fed a small bore fuel resistant pipe up the other original breather pipe from a centre manifold that I made up.
All seems to be adequate without issues so far and I have no smells now at all.

2 Breather Pipe Mod.jpg and



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PostPost by: Andiken » Tue Nov 17, 2020 2:03 pm

Thanks Alan, could you estimate the bore of the vent pipe please? I like the manifold, could you provide any further information please? Thank you.
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PostPost by: alanr » Tue Nov 17, 2020 2:32 pm

It was a while ago now but the small bore breather pipe I used was I think 4.5mm ID and 7.5mm OD.
The manifold was turned up from a solid piece of round brass, drilled and threaded accordingly with 3 x1/2 inch outlet tails for the large breather pipes and a smaller one 4.5 mm for the breather pipe.
Here's another shot of the manifold. As you can see i mounted it on a piece of plywood stuck down with Tigerseal.
Hope this helps.
Fuel tank Manifold.jpg and


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PostPost by: Andiken » Tue Nov 17, 2020 2:35 pm

Spot on, thank you Alan, time to fire up the lathe!
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