No start after HPOP on a 6.0 - Ford Powerstroke Diesel Forum
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post #1 of 24 Old 09-12-2013, 06:16 PM Thread Starter
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No start after HPOP on a 6.0

My first post so bare me please. I have an 07 that started out taking a while to start after bein parked for a few hours. I have IDS so I read ICP while cranking and would build pressure slow until it would start. This went on for a few weeks but I never trusted it to take a long trip I'd just beat around town with it and it never acted up while driving. I bought an Alliant HPOP icp and ipr. I used it one day to pull a small tractor 60 miles from home and when I got off the interstate it died when it went down to an idle. So I checked icp and it was around 16psi...far from 500. I changed the pump and ipr and now all I get is 87psi and that's it and it does take about 20-30 seconds of cranking for it to get to 87. I did check the ipr screen and was clean I've been trying this for 2 weeks and about to jump out my box! It has all the upgrades with standpipes and dummy plugs stc fitting studs deleted. Oil bowl fills quick and drain back valve holds but the lpop gauge does take a few seconds to come up but once it's up it jumps right up after another attempt to start. I don't mean to write a book but would a high pressure leak drain back and won't hold? bc icp drops to 0 right after I stop cranking it. I'd appreciate any help bc dynamite is beginning to look like my remedy lol
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post #2 of 24 Old 09-12-2013, 08:33 PM
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Do you have the motorcraft oil filter and cap on the engine??
Very important to verify this. Could be losing oil through poppit.


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post #3 of 24 Old 09-13-2013, 03:09 AM Thread Starter
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That's all I use is motorcraft. I even changed the filter standpipe bc the check at the top was broken but it made no difference
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post #4 of 24 Old 09-13-2013, 04:31 AM
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Did you buy the HPOP, or just the ICP n IPR.

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post #5 of 24 Old 09-13-2013, 05:05 AM Thread Starter
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Pump is new
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post #6 of 24 Old 09-13-2013, 05:07 AM
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What ID ur lpop pressure once its running?

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post #7 of 24 Old 09-13-2013, 05:13 AM
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How did you know (or think) it was a HPOP failure? If that was all that you changed out (plus ICP and IPR) it seems that wasn't your problem. Did your new pump come with the new STC? The HPOP is a fairly simple and straight-forward repair; are you sure you work was complete, including replacing both O-rings? Since you changed out your IPR, that should be OK, but a simple check would be to retry with a known good one or even your old one.

Regardless of previous upgrades, you need to perform a leak check of your HPOP system. Your IDS should come in handy for closing the IPR and monitoring your progress.

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post #8 of 24 Old 09-13-2013, 05:34 AM Thread Starter
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I'm beginning to think the pump wasn't the problem too. I'm pretty confident in my work with the two o rings on the pump and yes the pump did come with an upgraded stc. I did try the old ipr and same result. I'm just puzzled on how a high pressure leak can cause what's happening. My next move was to go under the valve covers and leak test as you suggested. Anything on the low side would cause something of this nature? Like the lpop not supplying enough volume or pressure? Guess I could check low pressure with a mechanical gauge


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post #9 of 24 Old 09-13-2013, 08:49 AM
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As long as it fills the oil filter bowl in a reasonable time it is OK. The HPOP takes its oil from the sump under the cooler.

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post #10 of 24 Old 09-13-2013, 09:05 AM Thread Starter
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So a high pressure leak could cause the sump to drain back? The oil pressure gauge does take 10-15 seconds of cranking for it to come up and once it's up the icp finally starts building slowly until hitting a wall at 87 psi after 30 seconds of cranking. No icp until dash gauge comes up. The long cold start was the preexisting symptom until it killed on the road. The gauge wouldn't come up right away and wouldn't start until it came up. I'm with you that the HPOP wasn't my problem but I just can't wrap my thoughts around a high pressure leak. When I get home tonight I will try an air test and see where that takes me. I appreciate the help


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