[TR] FW: TR6 with SU's - vapor lock??

[Mitch R. Meisler]

I had the exact same thing happen to my tr4a which had zs carbs.  It
turned out that I had swapped on K&N filters, and the chrome backers
blocked two breather holes (one each carb) for the float, and caused the
flooding and starting issues once the car got warm.  May not be the case
with yours, but if you switched filters, make sure that all holes are
open.  Drilling out the two holes (jeff playa at paltech figured
out/corrected the issue) solved it.


Mitch Meisler
Managing Director, Institutional Sales
CL King & Associates
410 Park Avenue, 16th floor
New York, NY 10022
212-572-3633-work
518-528-2263-cell
AOL IM = MEISLERCLKA
E-MAIL = mrm at clking.com

-----Original Message-----
From: triumphs-bounces+mrm=clking.com at autox.team.net
[mailto:triumphs-bounces+mrm=clking.com at autox.team.net] On Behalf Of
Terry Geiger
Sent: Tuesday, August 07, 2007 9:28 AM
To: Scott Suhring; Triumph Mail List
Subject: Re: [TR] FW: TR6 with SU's - vapor lock??

What fuel pump are you running?  It sounds like a stuck float valve in
the rear carb or high fuel pressure.  High fuel pressure will push the
float valve open, overfilling the carb.

I run an electric pump with a fuel pressure regulator set to 2.5 lbs on
my SU setup on my TR6.  Also, the fuel line is on top of the intake
manifold, away from the exhaust.  I also run a heat shield (provided by
Joe Alexander) to help keep things cool.

As a test, you could wrap the fuel line in some reflective heat
insulation and see if that helps.

Terry Geiger
'74 Triumph TR6 | '63 Triumph Herald | '70 MGBGT | '84 Mercedes 300D
Diesel http://www.shoalsbritishcars.org/


> From: John Krause [mailto:jktr250 at gmail.com]
> Sent: Monday, August 06, 2007 5:52 PM
> To: Scott Suhring
> Subject: TR6
>
>
>
> I have installed the Moss HS6 SU conversion in my 1970 TR6.  I can
> start the car, but when it gets hot, the car stalls and cannot be
> started until it cools.  When the car begins to stall, the rear SU
> blows fuel out of the vent tube.  I have all metal plumbing from the
> fuel pump to the front of the carbs ... the fuel line splits below the

> front carb and then feeds both float bowls.  The problem appears to be

> vapor lock, but does anyone have any thoughts as to why this is
> happening?  Could the metal fuel lines have
> anything to do with it?   Would a heat shield cure this problem?
> _______________________________________________
_______________________________________________
mrm at clking.com

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