Originally Posted by dsl_pwrd_ford
i see this around all the time, what exactly are they? how are they better over the stock pump.
7.3L Powerstrokes came with either a 15 degree HPOP or a 17 degree HPOP. HPOP stands for high pressure oil pump, and it is what makes our fuel injectors work. The 15* pumps were found in the OBS trucks 94-97 and the early 99's like mine. The 17* pumps were found in the late 99-03 7.3's and are a better pump beacuse they flow more oil than the 15*. Your truck should have a 17* from the factory.