Join Date: Nov 2009
Location: Lander, Wyoming
Diaphragm bits generally Do Not get into the fuel line, that I have ever known anyways.
The lips off of the 4 holed Selector Disk is the most likely culprit of rubber tid-bits jamming the float valve in the carb open. Therefore the 3rd little filter in what, 2012? Really! After 25 years production.
Many owners with the automatic valves Never turn them OFF and most try to avoid using reserve. So the selector handle sets in One position for months or even years. This allows the face of the handle to "glue" its self to the selector disk(thanks to ethanol). When someone finally runs low enough on fuel and needs to turn to reserve the stuck handle tears the lips of the disk.
Sometimes the lip stays attached for awhile, other times the carb flooding is nearly immediate.
One could change that selector disk (Part# 43049-1017 <$5.) as preventive maintenance every 2-5 years.
By using your Manual fuel valve daily or others using their Reserve frequently, the sticking/tearing of the selector disk is rarely encountered.