I'am kind of at a loss on what's going on with my truck. I'am pretty new to diesels so please bear with me....

I have a 94 F-350 with the PSD. I bought it non running and i can't seem to figure out what i need to do next. This is what it does have:

Cps works ( tach bounces)
Has fuel in filter bowl
Has oil in Hpop reservoir
No smoke out exhaust
Tried to unplug ICP and still no start

Capped one side of Hpop and installed mechanical gauge on other side, did not have any pressure coming out of Hpop. Replaced Hpop and IPR, still have the same problem that i had before i changed them. Tested pressure again and nothing.

I did notice when i crank the engine it takes about 10 seconds for the oil gauge to go up. If i let it sit for a little bit to let the starter cool down and try again, it still takes about 10 seconds for the gauge to go up again. Seems strange since the reservoir is full. My best guess is that it's dumping back to the pan and not letting it build pressure? Is there something i'am missing other than the IPR that would do this?

I'am kind of at a loss. I've searched multiple threads and forums and i really haven't come up with anything. I could really use some input.

 

I forgot to mention, I also do have a WTS light. And none of the fuses are blown.

 

Welocme to fte. Did you try to take pressure on the other side? You could have some injector/oring problems.

 

I thought about that, but i was thinking i took those out of the equation since i plugged the line that feeds the passenger head, and put the gauge on the other line that feeds the drivers head.

 

Have you checked the IDM for water?

 

The IDM has crossed my mind, but I wasn't sure if it just ran the injectors or if it would effect the pressure the HPOP put out? I looked down at it in the fender a few times and i didn't notice anything that looked suspicious. When they get water damage is it internal? or should i be looking for something on the outside?

 

How much oil do you have in the crankcase?

Check for missing parts inside the oil filter housing, see link below ...
https://www.ford-trucks.com/forums/8...r-housing.html

In some cases if that valve is missing HPOP reservoir <!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]--><!--[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="1026"/> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1"/> </o:shapelayout></xml><![endif]--> can't get enough low pressure oil from the pump in the sump. I think Brownie (Evan) had that problem.

 

Oil level in crankcase is full. HPOP level is also within a inch from the fill hole. Pretty interesting about the by-pass. It's worth a look for sure.

 

So today i took the oil filter off and checked the bypass valve. It is there and seems to be working right. Is there maybe a bypass valve in the block? I'am starting to think it might be a electrical problem?

 

Here is the troubleshooting flowchart:
https://docs.google.com/file/d/0Byb4...it?usp=sharing

 

That shed a little light on what's going on. Glad to see i'am on the right path. I've pretty much drilled down to bad IPR wiring. Since the IPR and HPOP are new it's about the only thing left on the chart.

 

Well, i pulled the fuel bowl harness and checked that today. Ohm'd out the harness and it all looks good. I can rule out the HPOP and IPR since they are new. According to the chart i've went as far as i can go. Anyone else have any more suggestions?

 

So you're positive it's not building HPO?

 

Iam pretty positive. I capped off one line from the hpop, and had a gauge on the other, so I know its coming right from the pump and not bypassing in the heads. Kinda acts like the IPR isn't letting it build pressure, but that's new and the wirings good. Maybe the pcm took a dump?

 

"New" does not always equal "good" or "working".....