The Fleece SureFlo Performance Sending Unit FPE-SF-GM-0410 installs in the factory sending unit location on 2004.5-2010 Duramax LLY, LBZ, and LMM trucks. It works with externally mounted lift pumps and removes the need for draw straws or tank sumps. The SureFlo bucket system helps eliminate the common ¼ tank fuel issue. It also includes a billet aluminum cap, new fuel level electronics, and universal –8 AN ports for custom fuel setups.