Has it run alright with these carbs before?
HIFs should be connected to an evaporation canister. I can't picture
overflow pipes anywhere. The lines connected to the canister can fill
with fuel and then fill up the canister if a float is full of fuel and does
not float. Did you compare float weights cause it is very hard to tell
sometimes if a float is full if it doesn't have an air pocket to give you a
"Sloshing" sound. They leak at the seams. Very common for these carbs.
I've been fooled by this twice. And boy does it make a mess on the
driveway.
Are you using an original pump, 3 lbs or less?
Mark
>
> --- Bruce Starke <bstarke@redshift.bc.ca> wrote:
> > Hi everyone--I need your help with this very
> > bothersome problem. I searched
> > the archives with no success. The HIF4 carbs (#AUD
> > 4450/4451) on my wife's
> > 1976 MGB (twin carb conversion by the previous
> > owner) persist in leaking from
> > the vent/overflow tubes AT IDLE ONLY. On switching
> > on the key, the pump clicks
> > till the carbs are full and then stops--no leak.
> > Once the car is started, fuel
> > spills out of the vent tubes until the car is revved
> > up when it stops leaking
> > until the revs are back at idle. The leak is huge
> > and not just a few drops. I
> > have replaced the needle/seat and set the float
> > height. Checked over the rest
> > of the carb and can find nothing obviously
> > amiss--even to the point of
> > dissassembling the choke device and finding nothing
> > wrong. There is no leak
> > from around the choke, jet adjustment screw or fuel
> > inlet. What am I missing?
> > Thanks for any help you may be able to give
> > Bruce Starke
> > GOLDEN BC
> > 1962 Austin Healey tricarb (at the painters now)
> > 1963 Austin Healey BJ7 (driver)
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