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Paul Nelson
New User
Username: paulnelson

Post Number: 2
Registered: 03-2018
Posted on Sunday, 13 July, 2025 - 14:31:   Edit PostDelete PostView Post/Check IP
Hi all, I have a Spirit chassis #4629 with twin SU carbs. I am having an issue with lots of fuel coming out of the float vent valve. Instead of venting to the outside via the hose attached to the chassis, I vented it to a bottle and filled it with in a minute. I have replaced the floats on both carbs. Any ideas would be appreciated!
Also I am looking for the brass fitting, with O rings that connects to the fuel inlet of the carb from the fuel filter chamber. (To the right of the black hose) I have contacted all the normal suppliers in the UK with no luck. If they are not available has someone else used another fitting - Thank youBrass Filling for Fuel Inlet
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David Hughes
Experienced User
Username: wedcar

Post Number: 183
Registered: 07-2004
Posted on Sunday, 13 July, 2025 - 18:37:   Edit PostDelete PostView Post/Check IP
Paul.
Others will know better than I regarding the Spirit cars, however for SU products in Australia, Midel at Punchbowl are Australian suppliers.
Burlen are the suppliers in Europe.
Regards
David
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Darryl Watson
Frequent User
Username: inox

Post Number: 225
Registered: 04-2015
Posted on Friday, 18 July, 2025 - 05:05:   Edit PostDelete PostView Post/Check IP
I don't know if it's applicable, The last SU I had was a 2" HD8 but the needle valve in the float chamber gives problems i.e. not stopping fuel flow causing the fuel leakage.
Easy solution replace the valve and reset the float level.
Also check the float level.
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Eric Molenaar
New User
Username: aussiewraith78

Post Number: 50
Registered: 06-2021
Posted on Tuesday, 24 February, 2026 - 21:46:   Edit PostDelete PostView Post/Check IP
I had the exact same problem today as Paul with fuel leak.
Turned out to be a split "o ring" as in the picture above.
Just replaced them both with viton o rings and no more leaks.
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Brian Vogel
Grand Master
Username: guyslp

Post Number: 3460
Registered: 06-2009
Posted on Wednesday, 25 February, 2026 - 00:38:   Edit PostDelete PostView Post/Check IP
Can someone who's done this post the AS568 size for those two O-rings?

That's the vital information to have, as there's nothing special about any O-ring other than having one of the correct elastomer to resist whatever it's used as the seal for.

They're always one of the AS568 sizes.

AS568 O-Ring Size Chart

Brian

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