Menno,
I don't have any overflow pipes at all yet on the twin SU's for the 67B and
am interested in the same question (actually, answer). The 74 parts car from
which I robbed the HIF's (for ZS conversion on the 79B) had a short piece of
rubber attached to a piece of metal pipe on each carb which met in between
both carbs and Tee'd into one vertical metal pipe that attached to the
bottom of the motor.
Monte
79B, Carmine
67B, BRG
74 1/2 Rust, parts car
----- Original Message -----
From: <Menno.Meijer@ict.nl>
To: <mgs@autox.team.net>
Sent: Thursday, April 24, 2003 5:13 AM
Subject: SU HS4 overflow problem
> Experts,
>
> Recently my rear carb had an overflow problem. (fuel came out
> of the overflow pipe) After cleaning it all (chamber, needle
> and seat) the problem was solved.
>
> What worried me was the following: The PO probably replaced
> the "original" overflow pipes with short rubber hoses. (approx.
> 40 cm) The result was that fuel leaked on the inside of the
> engine compartement. (This worried me because of the possible
> risk of fire)
>
> Next to the disadvantage of the possible risk of fire the ad-
> vantage was that I smelled the fuel, stopped and found the
> problem. I wonder whether I'd found the problem so quickly when
> the overflow pipes were long enough and the fuel leaked on road.
> (while driving)
>
> At first I thought that the rubber overflow hoses were original
> but according to my catalog there should be metal pipes with a
> small piece of rubber between the lid and pipe. (In order to
> reduce the risk of fire these long metal pipes would make sense)
>
> Q1: What should be the length of the overflow pipes attached
> to the lid of the fuel chamber? (I expect them to be that
> long that the fuel will never touch any "hot" part of the
> car)
> Q2: What's the "usual" way of detecting an overflow problem when
> these longer metal pipes are fitted? (I expect a rough
> running engine because the fuel level in the carb would be
> too high)
>
> Specs: 1963 MGB, 2 SU HS4 carbs.
>
> Greetings and looking forward to your responses,
>
> Menno Meijer
> The Netherlands
>
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