[Mgs] MGB carb question

[Hans Duinhoven]

That is so true Larry. 
I do not expect the HS4 carbs on Dave's engine will have the three connections.
These were released when the Evaporate Loss system was introduced in late 1968 I think. 
Anyway, in MGB's containing a charcoal filter cannister - the black cannister filtering the fuel vapours, rocker cover vapours and crankcase vapours. 
The HS4's in my 1971 GT still are the original ones - that latest MGB's equipped with HS4's. The 1972 models were equipped with HIF4 carbs. The HS4 carbs in my GT however already were equipped with "swing needles", which were standard in HIF4. 

Cheers,
Hans

-----Oorspronkelijk bericht-----
Van: Larry Colen <lrc at red4est.com> 
Verzonden: Tuesday, 11 April 2023 19:57
Aan: Hans Duinhoven <h.duinhoven at planet.nl>
CC: dave northrup <dave at ranteer.com>; mgs at autox.team.net
Onderwerp: Re: [Mgs] MGB carb question

Note the hose on top of the manifold where on Dave’s it is just open to the air.  

Also note that one of Dave’s float has three connections, one is for fuel in from the pump, one is for fuel to the other carb, and one is for ventilation.  I have mixed up the fuel in and vent lines and things have not worked well.

> On Apr 11, 2023, at 9:15 AM, Hans Duinhoven <h.duinhoven at planet.nl> wrote:
> 
> Here’s a picture of the rear HS4 carb in my 1971 BGT.
> Looks very similar to yours.
>  
> Cheers,
> Hans
>  
> Van: Mgs <mgs-bounces at autox.team.net> Namens dave northrup
> Verzonden: Monday, 10 April 2023 17:50
> Aan: mgs at autox.team.net
> Onderwerp: [Mgs] MGB carb question
>  
> These carbs are on an mgb engine in an mga.  We acquired this project in kit form so I'm not sure what i have.  
>  
> I suspect these are mga carbs?
>  
> And i don't know what to connect where.   The engine runs as is but I'm sure I'm missing something.  (Little joke there).
>  
> Can someone send me a picture and/or help me out?
>  
> <Carb_brake_switch.jpg>_______________________________________________
> 
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--
Larry Colen
lrc at red4est.com  sent from ret13est