High Pressure Oil Pump ? - Ford Powerstroke Diesel Forum
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Old 06-26-2013, 12:17 PM
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High Pressure Oil Pump ?

I thought I would share this. I suspect a slightly weak HPOP. I ended up getting my HPOP from the same company that Tuscany did last year. The good news is the pump is now less expensive ($519) from them via their eBay site. I will know further after I replace the pump, IPR and STC later next week.

Here are the pics in order of oil temperature. The AP was all the way to the floor so I was a little surprised at the 80-90%ish readings. However, the PW remained maxed out. Fuel pressure is reasonable, but not ideal, for a stock (blue spring) system with 190/50 injectors at WOT.









The ICP remains within 2600-2900 psi once the temps are at normal operating.
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Old 07-04-2013, 06:45 AM
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Just in the process of changing out the HPOP, looks like the STC may have been the start of the problem.

https://www.youtube.com/watch?v=NEQN...yer_detailpage


Any thoughts on the play? As I said previously, on a stock truck this would have gone unnoticed!

Last edited by twoicebergs; 07-04-2013 at 07:04 AM. Reason: IT JUST WON'T EMBED TODAY?
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Old 07-04-2013, 06:23 PM
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Doesn't look like a problem with the HPOP just replace the STC with the updated fitting and run it. As easy as it is to replace with numbers like that I would gamble on just replacing the fitting. Unless you want to spend the money for a new pump.
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Old 07-04-2013, 08:42 PM
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I figured it was better time wise to be ready to change them both out.
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Old 07-05-2013, 10:29 AM
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UPDATE - There still may be some air in the system, but I have driven it for a few hours in traffic and a few WOT runs. The pressure with the new (reman) pump appears the same or just slightly lower than the previous pump at max flow. The trucks performance is very good, but I am starting to wonder if the system can't keep up with the 190/50s, given they are open port. I will give it a few more days before I rethink where I am at; I don't really want to put on a dual pump. It would be interesting to know if a lesser PW tune would yield better torque/HP with greater ICP.

Last edited by twoicebergs; 07-05-2013 at 04:58 PM. Reason: new update
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Old 07-13-2013, 12:20 PM
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I ended up replacing the new IPR with another new IPR. The end result was a wash as the pressure is identical, maybe 50 psi higher than the original HPOP. It is quite obvious now that 190/50 open port injectors or larger require a second pump to keep the ICP up at maximum at max fuel flow.

Refer to further thread on 190 injectors and ICP. 190cc Injectors and ICP - Need your input
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