Hi,
Here is what I did
Flexible in tank fuel pickup is 3/8 NPT X 1/4 NPT.
Do not replace the anti siphon valves, remove them from the tanks. The primer bulb already has an anti-siphon valve.
Order two 1/4 male NPT X 5/16 hose barb fittings. These screw into the flexible fuel tank pick up...