Yes, I know the pump can be accessed from under the rear seat. But, I want to see if somehow dirt is getting into the tank... Thats what im thinking is the problem. Maybe through the filler?

1999 Mystique LS V6 Alpine CDA-9807, Rear deck sub, Opt. TB, K&N RU-3530/MAF adaptor, custom heatshield, FSVT 17's, SCT 4-program chip, Eibach's/ST200's, Hella Fogs...