Another HPOP/LPOP question - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-06-2014, 04:20 PM Thread Starter
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Another HPOP/LPOP question

I have a '96 F-350 with a cold start issue. After cranking, the HPOP reservoir empties. I've been a lurker on here for a while and have found some great info, but I can't quite find another thread with my symptoms. This is my first post, so forgive me for whatever I probably did wrong

First start of the day is almost impossible if the temp is under about 20*, even plugged in. The engine will crank and blow white smoke, RPMs read a couple hundred, but it will not catch. If I refill the HPOP reservoir then it will start and continue to run and the rest of the day. I checked this morning, and the reservoir was full, but after cranking it emptied. This only happens when it's cold, and started in the last couple months.

I have read it could be the LPOP or a bad injector o-ring, is there any way to tell which it might be? BTW it has new batteries, new starter, new GPR and relatively new GPs.

Sorry for the long post, and thanks in advance.
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post #2 of 6 Old 01-06-2014, 04:42 PM
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During the long crank, does the pseudo-gauge for oil pressure on the dashboard respond?

Last edited by madpogue; 01-06-2014 at 06:49 PM. Reason: Spelling
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post #3 of 6 Old 01-06-2014, 05:01 PM Thread Starter
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Quote:
Originally Posted by madpogue View Post
During the long crank, does the pseud-gauge for oil pressure on the dashboard respond?
It does not, unless I fill the reservoir.
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post #4 of 6 Old 01-06-2014, 06:56 PM
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Hmm, you'd think if it were the lube oil pump (LPOP), it would not keep running. You'd think if it were the check valve that keeps the HPOP reservoir full, it would drain while parked. Bit of a mystery. Why is it not providing oil to the HPOP reservoir while cranking, but it IS providing it, enough to run the truck, once it gets up on its feet?

You could remove the gauge sender and install a mechanical gauge there, and see what that tells you. IIRC you can also connect a mechanical gauge to a fitting on the oil cooler, somewhere near the filter mount.

Be careful, BTW, about repeatedly filling the HPOP res externally, as that's a net increase in the oil level; you do not want an overfull crankcase.
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post #5 of 6 Old 01-06-2014, 07:45 PM Thread Starter
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I'm glad I'm not the only one this has stumped. What it seems like to me is the LPOP isn't pumping enough oil during cranking to refill the HPOP. Is this a symptom of a worn LPOP? Also, if it were a bad injector o-ring it would leak down overnight, right?

This only happens when it's really cold, like less than 15*. Could my oil be too thick at that temp for the LPOP to pump? I run RotellaT 15w-40.

And yes, I've drained some oil out to keep from overfilling it.
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post #6 of 6 Old 01-10-2014, 07:39 PM Thread Starter
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So, ended up replacing the glow plugs and relay and she fired right up. I also found my block heater cord was shot, so I had no hope of starting when it was cold. Hopefully that'll fix my issues

Last edited by elicummins; 01-12-2014 at 10:18 PM. Reason: Adding info
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