[Mgs] MGB driving me nuts

[Bob Howard]

Paul,
   A slow response to this topic:
   The car had suffered from what seemed to be fuel starvation for a
couple of days. Used for short trips those days, it stumbled but got
through the day's business. 
   But then I learned that if you fill the tank and the car is parked on
hot tarmac for a couple of hours with a blocked vent line, the fuel
expands enough to flood the carbs and to blow out of the filler cap when
the cap is removed.  I agree, it probably would not do that if one were
driving and lowering the fuel level, but it happened to me just before a
business meeting.  The odor of the fuel on trousers isn't so bad, but
skin itching caused the meeting to seem even longer than it was. 
   The whoosh of air was the key to the problem. I had not noticed the
slight vacuum/suction on short drives before the exciting event. 
Bob

   
On Fri, 29 Aug 2008 08:52:47 +0100 "Paul Hunt"
<paul.hunt1 at blueyonder.co.uk> writes:
> Firstly if the vent line is plugged you *won't* get fuel from the 
> tank going
> into the canister, because the vent line *is* blocked, although it 
> will cause
> fuel starvation.  And unless you remove the fuel filler cap you 
> won't be able
> to blow through the vent line anyway.  The easiest test for a 
> blocked vent
> line is to remove the fuel filler cap when it starts acting-up.  If 
> you get a
> whoosh of air it *is* blocked, and you should be able to start the 
> engine and
> drive off normally immediately.  But a blocked line wouldn't allow 
> you to
> drive off normally *until* you had removed the filler cap, or left 
> it for some
> time, and it would cause the same thing to happen every few miles, 
> not once
> every few days or weeks.  Even a vent line that was intermittently 
> blocked is
> unlikely to act like this.
> 
> PaulH.
>   ----- Original Message -----
> 
> 
> 
>    One thing to check is that the vent line from the adsorbtion 
> cannister
>   to fuel tank is venting. If plugged, you can experience both lack 
> of fuel
>   and fuel being pushed into the adsorbtion cannister.
> _______________________________________________
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