Recently experiencing a problem with fuel delivery. The engine surges (I assume it's air mixed with the fuel) when I'm accelerating hard or climbing steep hills. Only occurs when FSV switch is on the front tank. Seems odd in that the problem instantly goes away if I switch to rear tank??? I assumed the surging would continue until all of the air was purged from the lines and filter but it immediately stops after flipping the switch to rear tank. Anxious to hear any related experiences with similar symptoms. Maybe time for a new FSV?