Sorry for the delay, Patrick. If I'm reading the problem correctly, I don't think you have a problem with the fuel filter, but instead need to "bleed" the fuel line of air. As noted (with full details for others), the IMS tank fuel outlet is a little lower than the carb fuel inlet. I have a fuel line that "loops" upward from the petcock and down to the carb to avoid any kinks in the fuel line. For this to work, there has to be gas in the line for it to flow properly down to the carb so it siphons if there isn't enough fuel "pressure". Sometimes, based upon the amount of fuel in the tank or if it has recently been installed, there can be air in the line at the top of the loop and the fuel will not flow. To fix this, I simply disconnect the fuel line at the carb, pull it down until it freely flows gas, plug the line with my finger while putting it back on the carb inlet and tighten it up. That fixes any fuel starvation problem caused by the looped fuel line. Bob - are we talking about the same issue with the looped fuel line?

Also, to get the maximum amount of fuel out of the tank when the level is really low and the bike has started to sputter, I lay the bike over to the left to drain the right tank lobe into the left lobe if I have run out. When I do this, I usually have to bleed my fuel line because it has probably run dry...

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Pain in the Butte Ranch
Durango, Colorado