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

[Terry Geiger]

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?
> _______________________________________________