subasurf

Just take the carb apart and give it a clean. Be sure to remember how it goes back together, but just give the pipes and what not a got hard lung full of air to dislodge anything that my be clogging it. I tend to soak mine in turps are metho spirits to give it a solid clean. But before hand, I try and remove all the non-metal components.

If a clean carby doesn't solve the issue, then the fuel lines may be clogged or cracked, resulting in no suction reaching the fuel in the tank.