Roger
there is an adjustment to be made that sets the height the float bowl
comes to and closes the needle valve.
on my TR3 there is a 2 finger hinge like
device that is curved.
you set the height by checking it with a specific drill
diameter.
i cant recall the exact diameter but im sure some one will tell us.
check your workshop manual, it will have pictures.
Frank
From: Roger Elliott
<elliottr at rmi.net>
To: triumphs at autox.team.net
Sent: Thursday, May 10, 2012
7:56 AM
Subject: [TR] Float bowls overflowing
Hi,
I have a 1980 Spitfire
with dual SU HS4 carbs. I noticed while trying to get to run correctly that
the front fuel bowl had gas coming out the top vent hole.
Figuring that it
was the needle valve sticking, I replaced the needle valves and floats in both
fuel bowls.
The front bowl (second in fuel line) contined to overflow. I
thought that there may be a crack or something in the lid, so I dug out
different lid, put the new bowls and valves in the lids, made sure the float
adjustment is correct.
These lids have vent tubes, which I have connected
with fuel hose - above the carbs.
Well, gas is coming out of the vent hose
connected to the vent tubes - not sure which carb is overflowing at this
point as I did not think to disconnect them until after I stopped working on
them for the evening.
The fuel line now has a T-connector to get gas to both
carbs. Previously, the rear carb had a fuel pass through.
I have a
mechanical fuel pump, not original. But one sold by one of the big vendors -
don't remember which now.
Can the mechanical pumps put out too much
pressure? The pump has been on for a few years and it has run correctly in
the past.
Assuming I haven't botched installing the needle valves and floats,
is there anything besides excess fuel pressure that would cause the bowls to
overflow?
Thanks,
Roger Elliott
1980 Spitfire
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