The float it likely to be too high on that carb. Secondly there may be grit
in the float needle - preventing it from shutting off excess fuel. This is
the only thing that holds back the pressure from the pump.
Peter S
----- Original Message -----
From: Aidan Corcoran <aidan@acquirer.com>
To: <spitfires@autox.team.net>
Sent: Monday, May 31, 1999 2:07 AM
Subject: MK 2 Carb question
>
>
> I had my '66 Mk 2 out for a spin over the weekend, and after a 7 mile run
on
> a motorway (we don't have very long ones in Ireland), there was a great
> smell of petrol in the cockpit. Pulling over and opening the bonnet
revealed
> that the overflow on the first float chamber was throwing out petrol. Now
I
> know I'd been driving a bit faster than I normally push the old girl, 60
Mph
> or so, but petrol flying around the engine is not something I want.
> Sustained speed at 50 does not have this problem at all. It also happened
to
> me a few weeks back when driving the car back through the Welsh mountains,
> but I put it down to badly closed clips around the carbs. The second float
> chamber is fine - no leaks, no overflow.
>
> Have you guys got any ideas what might be going on?
>
> My best gueses are:
>
> 1 The float is the first float chamber does not close properly, and so is
> always allowing petrol in, and with the high revs (4000) at 60, the petrol
> pump is pushing in more than is used.
>
> 2 Is there some kind of return valve on the fuel pump that is acting like
a
> non-return valve, and always pushing petrol into the carb system even when
> it's full.
>
> With the holiday weekend coming up, I feel a full seal refit coming on for
> the carbs...
>
> Thanks in advance,
>
> Aidan
>
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