RE: US 41 Foaming
The Walbro filter clunks are a very goog idea regardless of how a tank is mounted or what type it is. Gas is not prone to foaming like glow fuel but sloshing with any liquid can be a problem at times. The felt clunk goes a great distance in balancing that out, plus it's heavier and stays in the fuel supply better. Not to mention exit filtering. The felt clunk eleminates the bubbles in the fuel line caused by vibration and provides a consistent fuel supply.