Fuel spilling from carburettor after servicing it?

I have a Fiat Uno 999c which has a Weber 32 TLF Carburettor, I service the vehicle myself and decided it was time to do the carb as well. I bought a kit and stripped the whole thing adding all the new parts. Once I had it back on the Manifold and tried starting the vehicle I took for a second and then died... I noticed fuel was bubbling from one of the Jets on the top section. I have a Haynes Manual and had checked the float level to be correct.

I'm not sure what could be the problem but I'm certain it has to do with the Needle Valve.

I'd really appreciate input from someone who has more experience than me - Thanks

2007-07-22T02:48:15Z

Hey all, I found the problem.

As it was the first time I stripped a carburettor I wasn't sure where all the new parts would go so I put the stuff I removed aside as I found the new parts to replace them with. However the gasket between the fuel bowel and float was very brittle and broke apart as I removed the float etc.

Only once I opened it again on Friday did I find I had placed the new gasket on the wrong half and as such it was pushing down on the float which kept the needle valve open... hence the fuel spilling.

Thanks for the help though.

Anonymous2007-07-19T09:59:17Z

Favorite Answer

Good for you working on your own car. My guess is that your assumption is 100% correct if indeed the float is correctly set. I think you might have a spec of lint from a rag used for cleaning or a piece of dirt between the needle valve and its seat preventing the float from completely shutting off the incoming fuel from the fuel pump. Believe me, it's hard to keep debris out, and it doesn't take much to mess up an otherwise professional job. Try taking the needle valve out and flushing gas through. If you have compressed air , gently clean passages. If this doesn't work, disassemble and clean, clean, clean. Good luck. Don't feel bad if your work caused it because it can happen to anyone, ie in 1960, my bran new Chevy station wagon went back to the dealer three times before it was finally fixed. The last time the carburetor caught on fire so be aware.

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Smitty2007-07-19T09:44:27Z

I don't have experience with Weber's but it sounds to me trash. A little something is keeping the float open (if it has a Float) or a control device (needle valve) is stuck. In my experience I would say pull it back off and double check. You will probably find something small and simple that didn't go as planned. good luck

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Big Deall2007-07-19T09:40:37Z

Either the float valve is stuck or the float has a pin hole in it.

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Yes I am here!!2007-07-19T09:40:48Z

sounds like you got trash under the valve needle or it is sticking. new ones can stick just as much as old ones. try a new needle.

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