RepairPal Certified shops can diagnose and repair your 2003 Hummer H2. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You have performed all testing, including anti-theft testing (all good) and checked for fuel pressure and have none?
I believe the relay is in the under hood relay box, but cannot currently identify proper reference information for this.
Labeled - F/PMP