> Am I safe to assume this is a float valve problem?
I would not assume that, especially since you say the engine dies completely
later on. Incoming fuel is routed to the front carb first, so if there
isn't enough to feed both carbs, the rear carb is the one that starves. And
the engine will run (although not well, dies at idle, etc) on just the front
carb.
I would be looking for a fuel delivery problem first. Most "vacuum test
gauges" will also measure fuel pressure. Tee it into the fuel line and prop
the gauge under a wiper arm so you can see it when the engine starts to act
up.
http://goo.gl/HnvRG
As I think someone already mentioned, you can try leaving the fuel cap open
to be sure it is not a tank venting problem.
-- Randall
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