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Re:[T3]Carb Backfire Continues


On 21 Dec 2004 at 22:25, Steven Cooper wrote:

> Am I correct in assuming that this would be caused by a needle valve which
> doesn't close properly or closes too late?

I think you must mean float valve. Yes, that's what I would suspect. My guess 
is that something in there is misassembled so that the float valves can't 
close. They are fairly easy to test with the carbs out: Just note that with the 
carb upside down, the weight of the float should close the valve. You can test 
this by blowing in the inlet with the carb upside down.

This is something you should do at the end of every rebuild.

You can also test the valves themselves when you install them by just pushing 
the valve closed with your finger while blowing in the inlet. This should weed 
out defective valves. I don't think defective valves should ever happen, but 
that possibility comes up here fairly often.

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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