Dave,
Try clearing the vent line from the plastic cannister back to the fuel
tank. If it's plugged the expanding gas in the tank pressurises the fuel
line, then forces extra gas into the carbs, which then floods over into
the plastic cannister. If the vent line is clear, expanding gas in the
tank goes to the separator in the trunk, then the fumes (only) go forward
to the plastic cannister.
This happened to me once. The vent line in my '72 GT was clogged with a
rusty, gummy, sludgy mess. One it was clear, problem disappeared, along
with a host of hot-weather hard starting and stumbling problems.
The vapor recovery system does not affect performance adversely; it may
actually recover a teaspoon of gas that would otherwise evaporate, and
may be a good thing. The quick fix is to use a vented gas cap or to cut
a notch in your present non-vented cap's rubber gasket.
Bob
On Tue, 25 Apr 2000 16:01:10 -0700 "Dave Wood" <djw69@idt.net> writes:
> 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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