MX5 fuel filler valve not working very well

[The Veg]

I had a threaded bung brazed into the neck by my local radiator-repair shop, and then they ground-down most of what protruded on the outside so that the neck could still slip through the grommet. I think they charged me a whopping $10 for the job.

[JonB]

We don't really have local radiator repair shops round here, sadly; and I have no lathe equipped friends!

Which explains why I've not tried to implement the mod yet.

[alan.barker]

What's the biggest size for a "Rivnut"
Alan

[Mudmouse]

Alan, I see where you are going with a Rivnut however the shoulder on a Rivnut would be too large to get the body sealing grommet over so would not work. The outside of the filler tube must be flush. When I soldered the brass reducer to the inside of the filler tube it was very straightforward. The only issue is having a reasonably sized soldering iron, carefully cleaning the inside of the tube, good flux and preventing the solder running too far (hence use of solvent Tippex).

Steve

[alan.barker]

Steve,
i like the tip about the Tippex Solvent. You're right of course about no projection on O/Dia.
It's already a tight fit in the Grommet.
Alan

[john.p.clegg]

If you've a blowlamp?

Silver soldered mine...

John

[Mudmouse]

John, I almost did the same but when I saw how close the filler cap fitting (which is soft soldered onto the filler pipe) was to the brass reducer that I fitted I decided to soft solder it to the tube. Silver solder flow temp is between 650 to 780 deg C whereas lead soft solder is 180 deg C

Did you put a heat sink on the cap end to reduce this risk?

Steve

[gav]

Excuse my ignorance but where does the other end of the vent go to?
Thanks
Gavin

[Mudmouse]

In my case the vent from the filler goes to the nearest tank vent fitting and the other vent goes via a tank pressure limit valve to the normal +2 vent which comes out by he rear wheel after going via the roof.

[john.p.clegg]

John, I almost did the same but when I saw how close the filler cap fitting (which is soft soldered onto the filler pipe) was to the brass reducer that I fitted I decided to soft solder it to the tube. Silver solder flow temp is between 650 to 780 deg C whereas lead soft solder is 180 deg C

Did you put a heat sink on the cap end to reduce this risk?

Steve

Not that I remember,but I may have it stood on my Steel Flatplate while doing it..

John

viewtopic.php?f=51&t=33994

[alanr]

Gavin,
You need to have a read of the Club Lotus Breather Mod.

Elan +2 Petrol Tank Mod.pdf

(942.32 KiB) Downloaded 248 times

[gav]

Thanks Alan

That’s a really useful article which clearly explains the issue and solution.

Much appreciated

All the best
Gavin

[Matt Elan]

Hi Jon
I’m fully lathe equipped if you need a spot of turning once we are out of lockdown
Mat

[JonB]

Oooh you lucky fellow. Mind you, if I had a lathe I wouldn't know what to do with it. I'd need training.

Thanks, I'll let you know... come to think of it, a nice drive out to your neck of the woods might be very pleasant once this is all over.

JonB