Running E-‘anything’?, update those lines and primer bulbs to ethanol compatible. Lines like to break down and clog your system. (I also like to add an extra glass fuel filter between bulb & engine on the outboard.) Note: wave runners are inboards and you do not want to compromise of any fuel line fitments and connectors!!
If possible, store your boat with a full fuel tank….in winter, add a fuel stabilizer ..run the engine for 10 minutes to distribute stabilized fuel into the engine and fuel lines….top off the tank to reduce the amount of exchange with the air that may bring in condensation.
“…E10 may actually be a superior marine fuel, as it tends to keep low levels of water moving through the fuel system, keeping the system “dry”….However…”
E10 is certainly not as trouble-free as E0, especially the first few tankfulls. But for newer engines, those built after about 1991, there’s no reason the initial problems can’t be overcome. No less an authority than Mercury Marine says, “After the transition period from E0, E10 may actually be a superior marine fuel as it tends to keep low levels of water moving through the fuel system, keeping the system ‘dry.'”