[TR] Fuel starvation in my TR4

[Frank Fisher]

i recently had the exact same problems on the 3.
turned out i had developed
a kink in one of the soft fuel lines that was 
restricting the flow of gas.
Frank
To: triumphs at autox.team.net
Sent: Thu, September 16,
2010 7:27:16 PM
Subject: [TR] Fuel starvation in my TR4

I've got what appears
to be the symptoms of intermittent fuel starvation in my 
TR4, but I can't
figure out the cause.  I'm hoping the list can come up with 
some suggestions.
Symptoms:
- Car runs well and with full power for a while after start-up.
-
Loss of power and what feels like a miss under load after it's been driven a
while.  Going up a long hill seems to trigger the stumbling.  If I let up on
the 
throttle, it smooths out.  Sometimes it drives well again for a while.
-
Problem seems to be worse when it's really hot out (I live in Austin)
- Engine
idles smoothly even when it's not running well under load.

I replaced the
fuel pump and filter.  There is nothing in the fuel pump bowl to 
suggest
debris in the system, and the new filter appears to be remaining clean. 
I
have a Joe Curry heat shield on the carbs.

The car has never exhibited
anything like this in the 20 years I've owned it, so 
I'm trying to imagine
what new factor has entered the picture.  I'm suspecting a 
couple of
possibilities:

- Vapor lock because of a summer blend gas.  I don't know what
the local alcohol 
content is, but I'm thinking that it may have a much lower
boiling point than 
what I'm used to running.

- Flakes of rust or other
debris caught in the outlet pipe from the fuel tank 
that's restricting flow.
Any other ideas?

Thanks.

Dean Mericas
Austin, TX
1965 TR4 / 1974 GTV 2000 /
1976 Giulia Nuova Super

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