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[TR] Float bowls overflowing

To: triumphs@autox.team.net
Subject: [TR] Float bowls overflowing
From: Roger Elliott <elliottr@rmi.net>
Date: Thu, 10 May 2012 09:56:34 -0500 (GMT-05:00)
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Reply-to: Roger Elliott <elliottr@rmi.net>
Sender: triumphs-bounces@autox.team.net
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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