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Fri, 25 Feb 2000 16:24:15 -0800
Date: Fri, 25 Feb 2000 17:22:35 -0700
From: levilevi@home.com
Organization: @Home Network
To: Mike Mason <mmason@lindenwood.edu>
Subject: Any SU 6 Gurus? Maybe a fuel problem?
References: <Pine.OSF.3.96.1000225084745.27245A-100000@lc.lindenwood.edu>
Mike, Have you also had any idling problems? E.g. a hunting idle or a
big idle drop when the engine decelerates? Is the flooding every time
or every once in awhile?
If nothing else the list suggests works you may want to try taking the
bottom of float chamber off with the carbs still on the car. (I don't
know if this is possible with SU carbs but I recently did it on my ZS
equipped TR6.) Carefully pour the contents into a very clean bowl
(white if you can sneak one out of the kitchen). If you see little
black specs (or big specs for that matter) you may have the same
flooding problem I had/have. Contaminated fuel. Easiest thing to do is
put another inline fuel filter between the fuel pump and carbs and
replace the one you should have between the tank and the pump. Now put
the float chamber bottoms back on and try it out, you may have to do
take them off one more time to get the crud out that was in the dual
line to your carbs or left in the carbs.
I've had a hunting idle/idle drop/rough running/ problem forever that
I've been trying to solve (those that have been on the list for the last
two years can probably remember my pleadings for help). It wasn't until
I asked recently about fuel pressure settings for a fuel regulator
(another wrongheaded attempt at a solution) that Roger Bolick suggested
the black spec inspection. It solved all of those idle problems I was
having because the specs were making the grose jets stick open
intermittently and causing flooding/too rich mixture/etc. Grose jets
seem to be even more susceptable to black specs than the regular needle
jets (my opinion..more little holes on the grose jets that a black spec
can get into than the needle valve has). I now have a number (3) of
filters and extended fuel lines trying to clear the system of this stuff
and will change them all every month until the crud is gone. BTW the 6
is idling much better thanks to Roger's advice.
Bud Rolofson
Mike Mason wrote:
>
> OK, I give up. The front float bowl, about fifteen minutes after you shut
> the car off, will hiss or "sizzle" and petrol will run out of the overflow
> tube. I have replaced the top, put in a new Gross Jet (both carbs), set
> the float level within specs, and checked everything else I can think of.
>
> I detached the emissions hoses thinking that maybe back pressure was
> causing the petrol to pressurize and escape. These are Australian spec
> carbs fitted to a '73 TR 6 so no jokes about the float bowls being upside
> down on this side of the hemisphere. I tried driving upside down and that
> didn't change anything!
>
> Any more ideas? I am tired of getting en miles to the gallon because all
> the petrol goes on the ground. Fortunately no fires yet!!
>
> Michael
> St. Louis, U. S. of A. or thereabouts
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