RE: MAGNUM .52 XLS fuel tank Pressure line
My Magnum .15XL was like that, i was running at what the manual said 1.5 turns out, would run fine with no pressure line, hook it up and it would bog right down. I still run it today with the pressure line hooked up but the needle is only 1/2-5/8 of a turn out and this makes it very tricky to dial it in but it does work and runs very good.