Scott
Irv gave you a good pointer about the floats themselves, but here's another.
The Delrin needle valve
in the float chamber itself is notorious for sticking - either open or closed.
I first encountered
this in 1962 - and nearly every year since then, so it's not a new phenomenon.
The valve itself is likely made of hard, white nylon, is spring loaded and has
small fins. Glues and
muck in the fuel creates a build-up and this means the valve sticks and even
fuel delivery pressure
won't shift it. Take it out and with some fine sandpaper or glass paper,
carefully and gently 'sand'
the fins and just enough to grind off the glues. Then, wrap the sandpaper round
a cotton bud -
abrasive side to the outside and work it up and down its housing in the float
bowl lid. A good blast
of air on both should dislodge any dust. Put it back together and it should
then work again as it
should. When I had cars with SU carbs, this task was a routine one to be done
once a year in the
days of leaded fuel. Then unleaded came along and I had to do it every three
months!
Jonmac
----- Original Message -----
From: "Irv Korey" <emanteno@gmail.com>
To: "Scott Suhring" <suhringtr36@comcast.net>
Cc: "Triumph Mail List" <triumphs@autox.team.net>
Sent: Monday, April 27, 2009 7:32 PM
Subject: Re: [TR] SU Fuel Problem
> On Sun, Apr 26, 2009 at 9:15 PM, Scott Suhring <suhringtr36@comcast.net>wrote:
>
>> A friend of mine is having problems with his SUs that we just can't figure
>> out. Here is what he is experiencing:
>>
>> My 1970 TR6 is seeping fuel out of the rear SU float bowl overflow tube.
>
>
>
> What kind of floats are in your friend's SU carbs? There have been some
> problems with today's gas and the brass floats found in the H series SU's.
> The solder on the float fails, the float gets heavy, and gas comes out of
> the overflow. I think the HS floats are plastic, and I haven't heard of that
> happening with those, but it is worth a look.
>
> Irv Korey
> 74 TR6 CF22767U
> Highland Park, IL
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