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General Category => General Discussion => Topic started by: Bob Wegman on August 02, 2025, 03:39:53 PM
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The manual after market petcock I have on my 2002 EV is leaking. I would replace it if they were available, but they are out of stock at MG cycle. There are 2 o rings inside. Anybody here know the size and material if these o rings?
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Size wise I cant help but the best material is Nitrile otherwise known as Buna -N. Most hydraulic shops carry them.
Paul B :boozing:
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The new manual petcock I bought from MG Cycle leaked within a week of installation.
I would think Viton o-rings to be superior to Nitrile.
I'm thinking about something a bit better made like a Pingel. The 6000 series can be configured with an M16 adapter nut, but the outlet is too small. If they could fit it with a larger (11 mm?) outlet it would be perfect.
http://www.pingelonline.com/Fuel-Valves/power-flo-single-outlet-reserve-fuel-valve.asp
(https://i.ibb.co/mVHJj6W8/6411-AH-n.jpg) (https://ibb.co/mVHJj6W8)
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Mine leaked on the threads for mounting & I used Loctite #518, its a product to stop fuel. Used it on Aprilia fuel tank flange oring, Norge rubber gasket for fuel flange and rubber on top of Stelvio tank for early bodywork. It is a gell & doesn't harden.
I used it on the threads of coupling, no leaks years after use.
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Thanks for the help. I have it apart and will try some Viton seals if I can figure which ones will fit best. I will let you know if it works. If not I will hide in the corner.
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"Buna seals do offer superior abrasion and tear resistance and are more suitable for heavy-duty industrial applications."
"Viton seals hold indefinitely at temperatures up to 400°F and can last up to 48 hours at temperatures up to 600°F. Buna is effective to 250°F. However, it can effectively seal mechanical objects at low temperatures to –22°F. Viton seals are rendered ineffective at temperatures below 5°F, with the material becoming hard and inflexible."
Good bit of information:
https://www.manuf-rubber.com/news/buna-vs-viton-seals-whats-the-difference/
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I have a used one and if the gaskets are good, I could send them to you. But, I cannot get the thing apart. Circlip
off, unscrew the nut but it will not come off. It unwinds but then just spins. Italian devilry. Is there a trick I am missing? It should be a no brainer.
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Thank you for the offer. I replaced the manual petcock with the original part minus the electrical solenoid. I installed a bolt into the threads which held the solenoid. I will investigate an inline valve so I can remove the tank without draining it. No leaks at this time. So, this is a partial solution.
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The manual after market petcock I have on my 2002 EV is leaking. I would replace it if they were available, but they are out of stock at MG cycle. There are 2 o rings inside. Anybody here know the size and material if these o rings?
This post on the V11 Lemans Forum may help. These manual taps aren't the greatest, but the below highlights some modifications made to make them more reliable.
https://www.v11lemans.com/forums/topic/21761-manual-fuel-tap-issues/ (https://www.v11lemans.com/forums/topic/21761-manual-fuel-tap-issues/)