Lotus Elan

Filler Cap Breather Hole

PostPost by: William2 » Fri Nov 07, 2014 5:21 pm

I have just bought a new locking fuel filler cap to fit to my S4 Elan and would like to find out whether it is necessary to drill a small hole somewhere in the cap to act as a tank breather or not?
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PostPost by: types26/36 » Fri Nov 07, 2014 6:02 pm

Not if it is like this, doesn't yours have a hole here?
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S3 PETROL CAP 013.JPG and
S3 PETROL CAP 023.JPG and
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PostPost by: john.p.clegg » Sat Nov 08, 2014 8:50 am

Brian

Are you going to open out that split pin a little?

John :wink:

William

Is a breather needed (just for the filler tube) or doesn't the B**y elan not have the large breather tubes?

John :wink:
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PostPost by: types26/36 » Sat Nov 08, 2014 9:15 am

john.p.clegg wrote:Brian

Are you going to open out that split pin a little?:


No John, not for the moment, I need to sort a key out for it so it has to come apart again (the legs are slightly apart although the pic dosent really show it)
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PostPost by: TroonSprint » Sat Nov 08, 2014 9:24 am

I am also wondering about the tank cap vent. I have bought a new locking cap from Mattys and haven't noticed any sort of vent. The 2-seat Elan has no other tank breathers.

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PostPost by: William2 » Sat Nov 08, 2014 10:07 am

I am waiting to receive the filler cap in the post. The pictures I have seen of it on Ebay did not seem to show a breather hole so I will confirm when I receive it. Thanks for your comments, William.
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PostPost by: alan.barker » Sat Nov 08, 2014 11:48 am

where the locking part turns in the middle it's not airtight, so no problem. I have a locking cap on my baby elan
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PostPost by: billwill » Sat Nov 08, 2014 12:32 pm

Reminder:

PLUS 2 cars already have built in breathers, the cap does not need to breathe.
ELANs (two seater cars) do need a breather hole in the fuel cap.
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PostPost by: fatboyoz » Tue Nov 11, 2014 7:17 am

William,
When I bought my S4 (1987 in Hong Kong), one of the previous owners had removed the filler, bogged up the hole and used a VW filler neck and cap inside the boot. Fortunately, when I picked all of the bog out of the hole, the hole, and profile where intact and did not require repairing.
I purchased a new filler neck, seal and locking cap for the restoration. I can tell you now, that they seal very well. The first couple of tankfuls, after the car was back on the road, the cap was difficult to open due to a vacuum in the tank. The fuel tank was also oilcanning due to this vacuum.
On investigation, I found that the breather hole, as shown in Brian's post was only drilled on one side. There is a annular void moulded into the cap with holes drilled in each side, 180 degrees apart, or there should be. I had to disassemble the cap to drill the extra hole. This after speaking to the manufacturer.
Possibly worthwhile giving the hole a suck, just to be sure that all is in order.
Cheers,
Colin.


William2 wrote:I have just bought a new locking fuel filler cap to fit to my S4 Elan and would like to find out whether it is necessary to drill a small hole somewhere in the cap to act as a tank breather or not?
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PostPost by: William2 » Wed Nov 19, 2014 12:52 pm

Thanks for your help. I have drilled a small hole in the cap where indicated just in case of vacuum problems.
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PostPost by: TroonSprint » Wed Nov 19, 2014 2:02 pm

On investigation, my new locking cap from Matty's already has a tiny breather hole on both sides of the metal plate, so it shouldn't be a problem.

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