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MG MGA - supercharged carb overflow

I have had the Moss Supercharger installed on my MGA 1600 for several years and have been very happy with it.

The carb overflow has suddenly stuck wide open so the gasoline is pumping straight through. This model SU does not have an external float bowl so access is not a simple as it would be with the original carbs.

Any ideas for an easy fix?

Thanks,

Ted
Ted Persons

The HIF carburetors have an internal float with needle and seat arrangement like any other carburetor including the HS side float carburetors. I'm not very familiar with the HIF carburetors, but floats stick open and that sounds like what is happening with yours. Time for rebuild?
Russ
Russ Carnes

Hammer?
C Schaefer

Turn off the fuel supply and run the engine until the carb is out of gas. This allows the float to fully drop and possibly release the piece of stuff holding the valve open. Tapping lightly with the wooden end of a hammer is occasionally helpful.
R J Brown

Ted

Not sure from your post if you have an exploded view of the HIF carb. This link to the Burlen website shows a diagram of a generic HIF carb: http://www.sucarb.co.uk/ExplodedImageCoordinates.aspx?ProductId=33925

This link has details on all HIF carbs: http://www.sucarb.co.uk/ProductSearchResults.aspx?SearchTerm=hif

Hope it helps

Steve
Steve Gyles

This link may also be of interest: http://www.sucarb.co.uk/Technical.aspx?id=17

Steve
Steve Gyles

http://www2.mgcars.org.uk/cgi-bin/gen5?runprog=mgbbs&access=&mode=archiveth&subject=early/91&subjectar=71&thread=E199807240422540

http://www2.mgcars.org.uk/cgi-bin/gen5?runprog=mgbbs&mode=thread&access=61540502100012&subject=71&source=T&thread=200810230640502693

Copy and paste to address bar if no link. MGB Tech archives have lots of info regarding HIF SUs.
Russ
Russ Carnes

It turns out that the carb float sank. It leaked fuel and sank to the bottom. Replaced and running fine. One of those things that never happened with the old carbs.

Thanks for the input everyone.

Ted
Ted Persons

Ted

Quite a common problem. You have obviously replaced the float, so problem has gone away. However, the brass floats can often be quite easy to repair. Locate the perforation, drill a second hole to aid the draining process, then solder both holes. One of the floats on my 1948 TC consisted almost entirely of brass holes held together with solder and still worked fine!

Steve
Steve Gyles

This thread was discussed between 20/10/2008 and 11/11/2008

MG MGA index

This thread is from the archive. The Live MG MGA BBS is active now.