On early Bs with HS4s the overflow vents on the carbs connect via short
lengths of rubber hose to long, complexly bent steel lines that run down
the side of the engine and are held by a loop-type bracket attached by a
bolt, located low on the block, just above the oil pan. This routes any
excess fuel to the ground, avoiding the exhaust pipes. I fabricated mine
from brake line after looking at the correct setup at a meet. The bracket
was in place, but some DPO had lost the lines. I don't know how often
overflow actually occurs, but once would be too much if it spilled onto a
hot exhaust!
I would think a '76 had some kind of return line system to the fuel tank.
I wouldn't know if the SU overfows can be plumbed into that or not. If
not, you could rig the above system.
frank.walker@insurquote.com had this to say:
>hello list people, my 76 B when I got it had the zenith stromburg carb that
>it was supposed to have and after fighting with the one on my sons midget I
>have decided to try the SU's when I bought a parts car it came with 2 sets
>of SU and everything one pair was even polished. and when I bought my head
>it came with another pair. all of the throttle shafts have no. play now for
>my question where do the overflow tubes go do they just go away from the
>exhaust manifold and dump on the ground or what? Oh and my solution to the
>air filter clearance problem is to build a aluminum air box for the carb
>inlets and use a hose to connect it to a remote air filter from a fuel
>injected firebird out in front of the radiator giving the engine a cold
>air source.
>
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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