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Old 01-19-2014, 12:55 PM
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HPOP Leak?

Hey guys and gals, been a long time lurker and love the site! Ok so to my problem, I have a 2006 F250 6.0 CCSB 4x4 with about 126000 miles and bone stock except for a coolant filter and an edge cts, and a fuel pressure gauge. Sorry for the long winded post coming up but here goes....

The problem started New Years Eve when I went to start the truck and it would not start, just cranked and cranked. When I was attempting to start the truck I was watching the edge cts and noticed that my ICP was only getting to 364 psi and the IPR was reading 85% while cranking. FICM was 48.5 volts while cranking and battery volts were at 12.3. So I ended up getting the truck towed home and have been slowly working on it since then.

I first unplugged the ICP sensor and still no start. Went and bought a new ICP and same result, no start. So next I checked to make sure that I am getting low pressure oil in the filter housing and the housing fills up almost immediately while the truck is cranking. Next up I decided to remove the IPR valve and what I found was interesting, the screen and o-rings were not on the IPR. I used my boroscope and could not see the IPR screen inside the HPOP cover/housing. So next step I bought a new IPR valve installed and and tried starting the truck...same result no start but the ICP pressure went up to 425psi and the IPR still read 85% while cranking.

So now to today- I tried the HPOP leak test by using the ICP port to feed shop air in and made a pigtail to command the IPR closed. I had a slight hiss and some air escaping from the oil fill tube on the passenger side of the engine, and no other sounds/leaks that I can tell from anywhere else on the engine. Am I right at thinking I have a leaking dummy plug or stand pipe? Prior to this, I have had no issues with the truck, always ran fine and no black/white smoke what so ever.

Really need some help here, I am getting married in 2 weeks and we were planning on pulling the 5'er out to the west coast for our honeymoon. Again sorry for the long winded post. Thanks!
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Old 01-19-2014, 01:36 PM
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The HPOP system is a closed system, any air noise is because of a bad real/o-ring/gasket to cause air or oil to escape.

DIAGNOSING A 6.0L HIGH PRESSURE PUMP!


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