Should be 3/8", easy measure is to hold the lid upside down and lay a 3/8".
Bolt across it. Your wishbone should just touch it where it meets the float.
Sent from mobile Bill
On May 10, 2012, at 12:00 PM, Frank Fisher <yellowtr3 at yahoo.com> wrote:
> 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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