Joe,
My 72 B has an occasional problem right after I fill up the gas tank and
drive a short distance and park in the sun. I found that the gas expanded,
filling the carbon canister. When trying to start, it sucks out the gas
from the canister and floods the engine. This can be overcome by
disconnecting the hose from the canister to the carb temporarily and it will
start just fine. I don't know how to prevent it except to not fill up and
park in the sun on a warm day before using up a gallon or so of gas. If you
park with the front higher than the back the expanding gas will run out the
back gas filler cap. Incidentally, this doesn't do much good for the carbon
filter either. I usually just leave the hose disconnected until I think to
put it back on sometime later.
Dave
-----Original Message-----
From: Garner, Joseph P. <JPGarner@UCDavis.Edu>
To: 'MG list' <mgs@autox.team.net>
Date: Tuesday, April 25, 2000 3:34 PM
Subject: once is accident, twice is happenstance, and three times, Mr Bond,
is enemy action.
>okay so we're on happenstance here now
>
>I have had the same wierd stalling problem twice now... in the same parking
>lot!
>
>The car (79 MGB) starts up instantly when warm, and after turning over for
>maybe 2 seconds when really cold. Never had any complaints. Only twice now
>(just happened) it stalls in the parking lot at work. The only difference i
>can think of is that it is under really hot sun (but under a cardom so go
>figure). Anyway, it starts up okay, but then stalls when i let my foot off
>the gas to change from reverse to first. The first time this happened there
>was bad petrol smell, so i figured that i had flooded it and waited a
couple
>of minutes and it started right up. This time no amount of coaxing would do
>the trick. In the end we popped it into fourth gear and pushed it 20 yards
>to get the engine turned over. pushed the clutch down and it started up
>okay. Then it ran ran like a dream
>
>que????
>
>The air filter needs replacing.
>
>The carb seems to be running a little rich. could this all be a problem in
>the automatic choke? Sometimes if i stop at a light within about 3 or 4
>minutes of cold-starting then the revs creep up to about 2500. If i tap the
>gas then they rev up and then drop down naturally to about 1500. Only
>happens just after a cold start though. can this be the auto choke not
>shutting off properly? The engine sounds very smooth - no pinking etc. -
and
>last time i checked the plugs nothing which would indicate a long running
>fuel mixture problem.
>
>The car has a second cooling system fitted to deal with california heat.
And
>i have never seen the engine temperature get above about 20% of the dial
>(even on a 2 hour baking hot trip in california). I've been reading the
>thermostat thread so if i understood correctly, this can't actually be the
>problem right, cos the cooling system only comes on once the engine has
>reached an optimum running temperature? Could it be though that the air
>coming into the carb is too warm for the amount of choke? or have i got
>this all arse about face?
>
>any comments much appreciated
>
>cheers
>
>Joe
>
>___________________________
>
>Dr. Joseph Garner
>University of California
>Department of Animal Science
>One Shields Avenue
>Davis
>CA 95616
>USA
>
>Phone: (530) 754 5291
>
>
>
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