HPOP question - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by tommy vestrat, this thread has received 2 replies and been viewed 835 times.

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post #1 of 3 (permalink) Old 03-04-2007, 12:53 AM Thread Starter
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HPOP question

i know here i go again with a newbie question, bear with me guys i'm learning.the oil in hpop, is this something i need to keep a check on ? or is it the same as my engine oil ?
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post #2 of 3 (permalink) Old 03-04-2007, 12:56 AM
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It is your engine oil.

The only reason to check it would be if you had a hard-start condition and you wanted to see if the HPOP was draining off.

Then you could pull the plug in the top of the reservoir and check the level, otherwise you would not need to touch it.

Of course you could be really anal and suck the old oil out and refill every time you did an oil change, but almost no one does that. It's almost impossible to remove ALL residual oil from the system and compared to 15qts, the 20ozs or so that the HPOP res holds is of little concern.
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post #3 of 3 (permalink) Old 03-04-2007, 01:10 AM
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What he said ^^^^!

Also, the HPOP is the pump that supplies the power to inject fuel into the cylinders. The pressure of the oil leaving HPOP is controlled by the PCM via the IPR valve (Injection Pressure Regulator). MOST cases of low ICP (HPOP oil pressure) are a result of a wiring problem to the IPR valve, wearing out of the IPR valve, or loss of oil volume (ran engine out of oil, bad engine oil pump or oil pressure regulator). With really high miles and long oil drain intervals, the HPOP can wear out, but they DO NOT cause a "No Start/Hard Start" condition unless it is HOT. For cold starting problems, the HPOP is about the LAST component to suspect, but it is often one of the first replaced (in error).

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