Bassman: You have me perplexed on this tank problem. You are saying that if the line from muffler is going to bottom of tank he is adding air bubbles to tank (back pressure from muffler) I agree. However, that is what he wants in tank,pressure. I also agree the one from muffler should be the one that goes to top of tank. However, what is going into tank through that one, back pressure from muffler, same think. Only difference is one is creating bubbles in fuel because it is immeressed in fuel but those bubbles should not be going into fuel supply line. If that were so we would have that problem when we were inverted. Anyway That's my consensus.