Leaking manual petcock on EV

[Bob Wegman]

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?

[RinkRat II]

      Size wise I cant help but the best material is Nitrile otherwise known as Buna -N.  Most hydraulic shops carry them.

     Paul B

[Antietam Classic Cycle]

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



 

[guzzisteve]

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.

[Bob Wegman]

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.

[n3303j]

"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/

[Bisbee]

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.

[Bob Wegman]

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.

[Aldo]

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/