More than a few have made the mistake of putting hoses onto the wrong pipe.
Allen, when you checked that pipe to the fuel separator in the boot, did you
blow down it from engine space to the boot, listening for bubbling in the fuel
tank? Gentle lung-power should be all you need for that. If you do not hear the
bubbling and feel pressure in your cheeks, that line is not adequately cleared.
It gets a crud of stale gasoline and rust that can be an effective plug.
I have never thought that John Twistâ??s purging of the charcoal was worth
the bother. I prefer to get fish aquarium charcoal at the pet department and to
replace that disintegrated rubber filter with a piece of Scotchbrite.
Bob
> On Aug 21, 2020, at 1:54 PM, Hans Duinhoven <h.duinhoven@planet.nl> wrote:
>
> As the '71 B still is equipped with the HS4 carbs, it may be wise to verify
> how the top lids of the float chambers are looking. The evaporate loss pipe
> and the fuel inlet are located pretty near each other. Check for correct
> working of the floats and check if the needles are closing the fuel inlet
> correctly.
> Your story looks, if the pumps does not stop timely when the float chamber
> has reached its correct level of fuel.
> When that happens, the float chamber gets overloaded and the excess fuel will
> be fed into the charcoal canister.
>
> Hope this helps.
>
> Cheers,
> Hans '71 BGT NRG W/W
>
>
>
> -----Oorspronkelijk bericht-----
> Van: Mgs [mailto:mgs-bounces@autox.team.net] Namens Allen Hess
> Verzonden: vrijdag 21 augustus 2020 16:17
> Aan: mgs@autox.team.net
> Onderwerp: [Mgs] MGB evaporative loss system
>
> 71 mgb. A few years ago after the first startup in the Spring, I drove around
> the neighborhood to check things out. The car bogged down and I struggled to
> get home. Fuel had filled the charcoal canister and running out the bottom.
> The original floats showed some wear on the pivots, but not so much that I
> thought it would be the problem. Couldnâ??t find anything else so replaced
> the floats and valves and it has been fine since. This year I didnâ??t start
> up until May or June, same thing happened.
>
> Checked everything, no blockage, debris, worn parts. An internet posting
> mentioned the pipe union (near the fuel pump) that connects the charcoal
> canister to the â??widgetâ?? in the trunk. That too was clean. Purged the
> charcoal of gasoline (see John Twist) put it all back together. Fuel pump
> ticks briskly and stops before starting. Iâ??ve driven around the
> neighborhood a couple more times and it seems fine. Not being able to find a
> cause and fix it leaves me worried about longer drives. Any thoughts?
>
> Allen
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