EVAP Revisited

First off, a thanks to all who helped in my previous threads. Last week I replaced my fuel pump (only took a couple hours, a little help and a few four letter words :grinyes: ). Also replaced the evap purge solenoid after getting a 1441 code (flow during non-purge cycle). This is a 97 GP GTP, by the way, about 100K miles. Any ideas what else could trip this code? I'm thinking maybe a clogged vacuum hose or bad evap cannister--but then again I'm not too familiar with evap problems.
By the way, my temperature gauge recently stopped working. I don't think this is related but figured I would throw it out there. Thanks.