Originally posted by Boomer
Flash - can you tell me how it increases mileage?
Sorry for jumping in, but since I was online...
Before moving the pressure line to the top of the tank, my muffler/pipe would fill up with unburned fuel from the tank. I had to pour it out every 2 or 3 tanks of running. After the mod, virtually nothing comes out, just a couple of drops. Since the fuel isn't being sucked into the muffler/pipe, the fuel milage goes up.
And yes, my pressure line was configured as suggested by Associated - about 12 inches coiled (about a 1/2" radius) around the carrying handle.
Since some people don't seem to have any problems, my guess is that it's dependent on the engine that's being used. Different brands of engines have different port timings so some may cause more exhaust gas inversion - in other words, more suck back from the pipe into the cylinder. Pipe tuning is also related to this problem. Some engines have different tuning requirements and may induce more or less of this exhaust inversion. Bottom line is this can cause the engine via the muffler/pipe to suck fuel from the tank. Just a guess.