Lotus Elan

+2 petrol breather

PostPost by: davidallen » Wed Sep 28, 2005 12:13 pm

Hi,

There was an article a few months ago in "club lotus news" about an
improvement to the +2 fuel tank breather design to reduce petrol smell and
evaporation.

Basically the design entailed shortening and linking the two large pipes
directly above the tank to another large bore pipe which connects to the
filler. From this junction a forth small bore pipe is taken over the roof as
per one of the original pipes.

The theory was that the system would vent thro the filler when filling but
when the (non venting) filler cap was closed it would vent thro' the small
bore pipe with consequently less evaporation.

Has anyone tried this? As I have my headlining out at the moment I thought I
might give it a go.

David




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PostPost by: "Timothy R Dafforn&q » Wed Sep 28, 2005 1:21 pm

Have heard of the modification. Requires a bit of work on the filler...
I too was annoyed at the smell of petrol particularly as the garage is partof the house and I could smell petrol from the lounge!!
Ended up putting corks in the two pipes after the car was parked, a real faff!
Anyhow forgot to put one in one day, and the remaining one seemed to solve the problem. So I now drive round with one cork in position..
Seems to work, and leads to interesting comments at MOT time..
"Hey Mate, do you know there's a cork stuck in your pipe!!!"
Cheers
tim
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PostPost by: "e s" » Wed Sep 28, 2005 3:08 pm

Did it years ago, works perfectly.

Also stops the droop in the headliner

I didn't read the article, but in my car I 'T'd the two hoses clos to one sidethen ran the hose over the c pillar vent and down to the vent hole in the body. You need to keep it high so fuel doesn't spill out. The hose running over the tank wants to dress over the tank, not into the trunk so it doesn't fill with fuel and become useless.

The cork idea works on level ground, but if you park with a full tank and fuel blocks the un corked vent, fuel could theoretically be forced out the vent

Of course that could happen if parked on a hill with both, so maybe it doesn't matter......
----- Original Message -----
From: "ALLEN, David" <***@***.***>
To: ***@***.***
Subject: [LotusElan.net] +2 petrol breather
Date: Wed, 28 Sep 2005 13:12:33 +0100


Hi,

There was an article a few months ago in "club lotus news" about an
improvement to the +2 fuel tank breather design to reduce petrol smell and
evaporation.

Basically the design entailed shortening and linking the two large pipes
directly above the tank to another large bore pipe which connects to the
filler. From this junction a forth small bore pipe is taken over the roofas
per one of the original pipes.

The theory was that the system would vent thro the filler when filling but
when the (non venting) filler cap was closed it would vent thro' the small
bore pipe with consequently less evaporation.

Has anyone tried this? As I have my headlining out at the moment I thought I
might give it a go.

David




CONFIDENTIALITY NOTICE

The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the intended
recipient or person responsible for delivering it to the intended recipient,
you have received this communication in error and must not distribute or
copy it. Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication. Thank you.


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PostPost by: Hamish Coutts » Wed Sep 28, 2005 5:23 pm

David,

I have tried this mod and I did a post on the very subject a few weeks
ago on this very subject.

Basically the mod is a good one as long as the new breather to the
filler neck is, at least, the SAME diameter and the breather outlets
from the tank. Otherwise the tank will fill VERY slowly (this is from
painful experience!). I recommend you use flexible, petrol proof tubing
and good clips to avoid silver soldering/brazing. I got mine soldered
and now have hellish problems with rust in the tank (it clogs the fuel
filters in about 50 miles!!) which looks like it was caused by the
acidic flux used for the solder not being washed out properly.

Life is never dull when you have a Lotus is it? ... but you'll
forgive them anything when you're driving on the road.

Regards,

Hamish.
"One day I'll finish the restoration - honest, darling, just a few more years....."
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PostPost by: zuckerlowe » Thu Sep 29, 2005 6:19 am

Hi,
I'm not sure why the pipes cross over at all, I could only think it
was maybe something to do with reducing the chances of fuel leaking
out of the tank if the car was on it's side after an accident. I took
the pipes up the same side over the B post (rear or the door) and down
the normal route and out through the body work. This stops the
headlining sagging and also cured my fuel smell, as the previous owner
had joined the original pipes to some garden hose with a ground down
(and badly fitting) airline connector! The original pipes seemed fine
with no cracks and as they were now much longer than required, I was
able to cut off the yellowed (presumably by fuel) part.

Cheers
Steve (1968 +2)
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