Fuel hose size question Larson Cabrio 280

[Joe from ny]

Can anyone advise the fuel hose size on a 1995 Larson Cabrio 280 with twin 5.0 Mercruiser Alpha One drives? I want to put the Garmin GFS 10 sensors in the line. They need a 3/8 inch line, but the fuel lines on the boat look a bit larger than that.

Thanks

[Joe from ny]

For anyone interested, it was 3/8 inch hose. The guy in the shop said that the Trident brand lines are a bit thicker on the O.D., and therefore look different than normal size hoses.