may be a glob of gunk at the other end. better take tank out and have a look. good cleaning may do it.

 

there was a glob at the bendy part not the long straight part but careful coat hanger work, hot water, and a few bangs on a metal sink got it so it flows good now.

thanks for the help guys

 

I know this is an old thread but did this solve your problem? ... I have the exact same thing happening and I had suspected that it could possibly be a clogged reservoir hose but wasn't sure that it would cause these symptoms and my mechanic gave up on trying to fix it.