Riffraff Diesel Technical Knowledge Center
7.3L Powerstroke HPOP Failure: Symptoms, Diag and their Fixes.
Oct 24th 2025
The 7.3’s High Pressure Oil Pump is very reliable (fitting leaks aside…), but it can still fail or simply wear out over time. Diagnosing a failed HPOP can be fairly straightforward. Here&
… read more
Rebuilding The 7.3L Injection Pressure Regulator (IPR) - It’s easier than you’d think
Oct 9th 2025
The HEUI system on the 7.3L Powerstroke uses high-pressure oil for the fuel injection event. We won’t fully go into the system’s specifics here, but good clean oil is very important to its
… read more
Powdered Metal Rods: What are they? Why are they a problem? And how to check for them.
Posted by Adam Blattenberg on Oct 5th 2025
Let’s talk about Powdered Metal Rods, or PMR’s as they’re more commonly called. If there’s one thing that causes the most damage to the 7.3L Powerstroke in one shot, the PMR is
… read more
7.3 Powerstroke: What to look for when buying
Sep 4th 2025
The used market has been pretty hot for the last several years. Our old trucks are getting more popular every day! If you’re looking for a new-to-you 7.3, there’s a few things that are wor
… read more
Diagnosing HPOP Issues on the 7.3L & 6.0L Powerstroke's
Aug 30th 2025
The High-Pressure Oil Pump (HPOP) is the heart of the HEUI (Hydraulically Actuated, Electronically Controlled Unit Injector) fuel injection system used on both the 7.3L and 6.0L Powerstroke. When the
… read more






