so I testing it from a remote tank that was maybe 4ft below the engine and it works a treat
In fact, the return only seems to operate when you use the plunger (I think this is what you said/meant anyway)
Based on the above, I may just run the return into a small catch tank that is already mounted next to the engine if the only time I’m going to see fuel is when I use the plunger to draw it through. Do you see any issue with this?