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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