Got this code abut 2-250 miles after dropping the fuel tank to change out the fuel pump cover. Now the last two fill ups, the gas pump auto shut off is triggered after a couple seconds and I get fuel leaking from the top of the filler neck when I try to get some fuel in there. I can hear the "whoooosh" of the evap system through the filler sometimes. What should I be trying first, DMTL pump or the purge valve? Seems like one or the other may be stuck open. Is there a quick and dirty way to test one or the other without a GAP tool? I just have a basic OBDII reader, I think it'll do live data but have never needed to.