right now i run a pressure system like this. 1. use a sullivan No. S756 check valve at the muffler, to hold pressure in the fuel tank. 2. the take a fuel tee fitting, plug one nipple with JB-weld. then drill a small hole in the JB-weld, to .035-.045 inches, the hole needs to vent pressure to the air. put the tee near the fuel tank this will stableize the pressure. iam not sure it really does a lot. but it makes me feel good. the hole size was just gusted at.