i had a similar problem with my wisperlight ones, it tured out that oen of fuel line that go's from the pump in the resevoir was clogged. try the folowing, detach the pump, take out the pump handel (the rod with the plastic cup i mean) fil the inside of the pump with petrol or somthing lik that (i used 95% ukrainian drinking spirit) then reinsert teh pump handel and try to press it dowm (pump) if there is somthing cloged in teh tube that go's in the resevoir it will shoot out after a few times, at leat it did in my case.
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