[Chris Burkard]

You will have to find the vent on the inside of the hull and gain access. Remove the hose clamp and hose. Now try to flush the vent hose. If it is clear, now concentrate on the vent. You should be able to carefully take a small screwdriver and remove the blockage. It is not unusual for bugs to build nests in the vents. Mud dobbers are the worst, since they build a concrete like nest that cannot be removed by water pressure. It has to be scrapped out. Good Luck!