Drove my son's 05 GP base this weekend. When I went to put gas in it, I could only put in $0.20-$0.75 at a time and the gas pump would kick off. Went to Advance Auto and bought a new vapor canister vent valve solenoid. During install, I noticed that the old canister was filled with a grey dust and the line coming off of it was packed full of the grey dust. I cleaned it out as best I could, probably 18-24" into the line. Is there something else going on besides the vapor canister?