I have a 97 7.3 and have a few questions on the hpop.does the hpop get its oil from the motor or is it just filled by the plug on top of it.and if it does not get oil from the motor how do you go about changing it and how often should it be changed. thanks for any help
When you change the engine oil. The low pressure oil pump at the bottom of the motor, in the oil pan, will feed the high pressure oil pump. The HPOP will then push that new oil through the whole HPOS. So no need to change or drain anything other than what's in the oil pan.
Like said above, there is no need to change the oil in your HPOP, just do a regular oil change and it will cycle through, these trucks take a lot of oil anyways, oil changes arent the cheapest but its not bad