I have three rectangular diesel tanks. The three vents use a single, three
into one T so there is only one actual vent.
I know I need to re-do it as the T is below the level of the fuel fill. Fuel
entering tank A begins to fill tank B and C.
Does anyone have this part of the rules as I need to know if I will need 1
or 3 vents when I re-do it all.