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twin weber 40's
joolsmi16 - 23/5/10 at 04:41 PM

Hi all, fiddling with the car today and noticed that on both carbs I have a fuel leak on the same place on the two carbs...

Its underneath and looks as its coming from a m6 flat headed screw thats set up in a round casing, I tighten one of them a little but any ideas on this screw or possible issues.

Thanks

Jools

prawnabie - 23/5/10 at 04:59 PM

If its one of the screws in the top cover you may need a new gasket.

cliftyhanger - 23/5/10 at 06:07 PM

http://www.webcon.co.uk/weber/40dcoe.htm

does that help??

joolsmi16 - 23/5/10 at 06:11 PM

Hi, its not on top but underneath the carbs, just wondering if there is anything on the bottoms of these carbs were fuel can leak from??

joolsmi16 - 23/5/10 at 06:18 PM

Thats a good drawing of the carb but I can't see the screw in question...

This only screw is no.5 but the describtion is "screw"...

Paul TigerB6 - 23/5/10 at 07:59 PM

quote:
Originally posted by joolsmi16
Hi, its not on top but underneath the carbs, just wondering if there is anything on the bottoms of these carbs were fuel can leak from??


Probably gasket (36) has gone on the corner and allowing fuel to get to the thread of the screw (5) and then run down it.

That make sense when looking at the leak? Its either that or the fuel is dribbling down from somewhere else and ending up dripping from the bolt.

Worst case would be a stripped thread on that particular bolt that's allowing the leak!!

[Edited on 23/5/10 by Paul TigerB6]

prawnabie - 23/5/10 at 08:28 PM

Are you getting any popping though the carb at light throttle? If so its common for the pressure from the pop to hit the closed butterfly and travel up the jet into the carb and out the choke mechanism taking a bit of fuel with it.