[Uhehner]

I don't see an anti-siphon valve. I see a 1/4 turn valve with a pipe to flare fitting adapter and a flare fitting to hose barb fitting. Don't use me as the final word. Perhaps the 90 deg. fitting into the tank is an anti-siphon valve I'm not familiar with. Do you have fuel return lines to the tank on your 8.1's? Mine are the early ones with a single fuel line and a return that goes back to the fuel cooler.  Capt. George