Have you checked/changed the sintered bronze strainer under the big fuel inlet nut? They have a habit of clogging up and causing the symptoms you're describing. Your inline filter might noit be trapping all the sediment.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!