Some of the older fuel hose is not compatible with ethanol and can delaminate internally causing a blockage. I wold replace the bulb and fuel line since you are having the bulb problem.
Make sure the fuel line isn't pinched anywhere. I had the same problem with my new Seaark and the fuel tank had slid over against the fuel line and was pinching it closed.
2015 Seaark 1872 MV CC
Etec 90 HP
Bitter Gun Owner