[TR] BAck again - and with a question

[Andrew Uprichard]

I THINK I have it solved- although I'll have to wait for another day in the
90s to be sure.  Again - thanks to all who contributed.  And to answer
Randall's questions, the shield is between carbs and exhaust and the mixture
was set with the engine warm, but not on a particularly hot day.

After going through all the suggestions, I pulled the domes with the car hot
and noticed some fuel trickling into the forward SU.  Turns out I had a bad
float needle valve and seat.  My guess is the car could compensate most of
the time, but, as Randall suggested, high underhood temperatures exacerbated
the problem and caused the car to flood.  John Macartney also hit the nail
on the head. Oh, and while I was at it, I installed an electric pump as the
old one (an original) was well worn.

Andrew Uprichard



-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Randall
Sent: Friday, June 10, 2011 10:25 AM
To: triumphs at autox.team.net
Subject: Re: [TR] BAck again - and with a question

> I thought vapor lock was starvation due to the fact that the 
> fuel pump can't pump vapor.

Me too.  But lots of folks confuse percolation (fuel boiling in the carbs)
with vapor lock, and it has become a common problem due to the witch's brew
they sell for gasoline these days.

And even just high underhood temperatures can cause mixture problems,
especially if your mixture is already on the rich side.

Tell us more about the heat shield.  Is it between the carbs & exhaust?  Did
you set the mixture on a hot day?

-- Randall  

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