how to troubleshoot bad gasoline problem?

I recently got bad fuel. Before taking a sample I got it tuned to rule out ignition. Then a sample was taken and the fuel was weak to the smell and a little dirtyish.Run down to empty and several dry gas did nada to help. Next the tech removed fuel pump to check tank.He found to his dismay major dirt around the pump and under it.Major cleanup followed ;also blew out fuel line to and fro cleaned the injector screens and put it back together. Ran well for 1 and a half days then back to runnning poorly,Bummer! What should I look for next? This is a 2000 Honda Accord EX with 84000 mi on it. I pulled each plug tonite to scheck for dirt on them. None. Any suggestions?