I’m having problems getting a dellorto fuel pump to prime with a pulse line any longer than 12″ or so. I ran it once with the fuel pump mounted using rubber isolators just off the cylinder head. It pumped fine that weekend, and the PWM carb ran good other than some fuel coming out of the overflow. 2 weeks later I attempted to move the fuel pump to a location right next to the fuel tank, which of course required a longer pulse line. It wouldn’t pull fuel out of the tank when trying to prime the motor. I moved it back closer to the pulse line, and it still wouldn’t work. So I just rebuilt the pump, and now it works again with a short pulse line, but not a longer one. Any secret to getting it to prime correctly? I tried very stiff and softer pulse lines, no difference. Motor has very good compression, and no issues with a PWK pumparound setup.