Delphi Fuel Pump Module Assembly: With Float Arm, Seal

The high pressure tube was a little longer than OEM, but worked fine. Ring was a bear to get off, soaked overnight in penetrating oil, air chisel and BFH. I was going to lift side of bed for access (check youtube videos) but spun to 1 nut, and couldn't loosen another (opposite sides off course), dropping the tank gives you much better access to rusted ring, and the fitting were a little difficult to release (more penetrating oil). Used pic to remove 3/8' line, too much rust to get release tool in, plastic fitting also rusted, more oil. If your truck won't start right away (starter stays engaged until starts) you probably have no fuel to injectors, which indicates the pressure has bled off, otherwise runs good, smell gas when stop. Inspect connectors for seals intact and locks when installing. Dropping tank seems easiest after doing it, just need to cut the tie wrap above tank to drop to ground (re-attach). Remove all gas to reinstall to reduce weight. Plan on 3x your estimated time to account for rust & connector removal (can cut off old pump to work on). Tank strap bolt also lost threads at frame, so put nut on top to hold in place (difficult to remove with stripped threads, use pry bar to access threaded area.

After installing this pump, it Sets a P2635 code in the FPCM and P069E in the ECM. The truck will run but it will turn the check engine light ON for a Fuel Pump performance code P2635. The new pump failed 2 of the 4 fuel pressure tests. After removing this pump and again installing a new GM OE pump all is well. No codes, no issues.