SMELL PETROL? Remove the air filter lid. Can you smell petrol? If not, perhaps no fuel is reaching the carburettor. Start by making sure the choke’s working. Check the cable to the choke flap, jet or valve, as appropriate.
DELIVERY ISSUES Remove the fuel hose from the carburettor. Is there fuel in it? If not, direct it into a jar and crank the engine. It may take a while for the pump to prime. If this fails, check the tank, pump and any filters.
VALVES AND NEEDLES Fuel pump failure is likely to be due to dried out or sticking valves. Strip, clean and reassemble, if possible. If it’s OK, remove the carburettor top and make sure the needle valve isn’t obstructed or stuck.