Your problem could be that the valve below the primer is not operating or fuel tank is not venting properly. Try slackening the fuel tank cap and priming again. If this help try fitting a new fuel tank cap. If the machine has not been run for a while the carburettor sometimes "gums" up with 2 stoke residue. The valve can easily be replaced if it is faulty. Make sure you take a note of the numbers on the carburettor before trying to fint parts. I hope this helps
Gail T
July 2011