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Assuming you changed your coil to a 12V one, no it shouldn't make any difference If you have rust inside the fuel line, it will fall off and flow down to the carb, and either flow through or block the valve that is operated by the float. If it is one large chunk of rust, yes it's possible that it might only clog the flow every once in a while. Best thing to do would be to remove the float valve from the carb and clean it - and replace the fuel line if it looks like this could be the problem. Generally, though, you tend to get flooding if this is the problem as the lump of rust stops the float from shutting the fuel flow off. The float can stick in the chamber - but again it doesn't usually do this at the top, so you tend to get flooding rather than starvation. If you have the carb that is not a Zenith, check that the little flap of brass that shuts the fuel valve off is free to move, and not sticking shut sometimes. To check the flow, if your carb has a drain valve, undo it, and check you get full flow for at least two minutes. Try this especially after the tractor has started to misbehave, and check your result against when it is behaving properly. If you have consistent good flow, it would point to Phil's theory on wiring. You need to eliminate one potential problem at a time . . .so be patient. Well, it's some stuff to check, anyway. Good luck.
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