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Are you able to strip the generator tube down.  Going from memory (not too good now days) there is a filter at the bottom of the tube that can get blocked. The other problem could be if the pricker had broken off at the top, but unlikely on two lamps. The top half of the tube unscrews just above the valve assy. You can pull out the pricker and spring. and should be able to see through the tiny hole at the top. I used an old guitar string to clean out the top jet, as my primus pricker was too thick. Other thoughts are that the pump washers have dried out so are not giving any pressure, but again strange with two lamps, and you would feel no resistance when pumping.

EDIT

Re thinking, the filter is at the very bottom, where the tube screws into the tank. Perhaps dirty fuel, as both not working.