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September 29th, 2008

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Q & A: Desmogging

Friday March 29th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Dear John,

I've been following your desmogging how-to and have a couple of
questions about the vent lines leading to the cannisters (and removing
the cans). My B is an 80.

Is it okay to plug the fuel tank vent line way back in the trunk if I
drill a small hole in the underside of the gas cap?

Plugging the vent off the top of the valve cover will not cause any
harmful effects to the engine. True or false?

About the third vent line--the one off my Zenith carb. Surely you can't
just plug that one can you? Won't it upset the proper function of the
thing, such as it is? I've heard about fuel backing up in that line and
getting right into the cannisters.

Thanks for all the help to so many over the years.

pete in Toronto

ps: The four 7/16 by 1 inch bolts that I used to plug the air manifold
holes on the block stick out pretty far, a la the Frankenstein monster's
neck. How come you suggest 1 inch and not shorter? Just curious. Would
it work to braze fill the original screws?

DEAR PETE!

I should really update that "desmogging" article. We've used
7/16-20 x 1/2 socket set screws for years -- they give a nice flush
appearance.

DO NOT remove the charcoal canis... read more