[Mgs] MGB evaporative loss system

[Hans Duinhoven]

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 at autox.team.net] Namens Allen Hess
Verzonden: vrijdag 21 augustus 2020 16:17
Aan: mgs at 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. Couldn’t find anything else so replaced the floats and valves and it has been fine since. This year I didn’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 “widget” 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. I’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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