OK, the truck runs great. It only has 115000 miles on it. Stopped at station to fuel up, then it would not start. Finally got it started. It ran great all day. Every time you kill the engine for a short while it wont start back. I noticed that the oil pressure was not building up after turning engine over. It has good oil pressure when. It is running. Any suggestions???

 

It not only acts up at station, but.when you stop for lunch as well
However it does start every morning

 

What motor?

 

6.0 liter diesel engine.

 

Try the 6.0L Power Stroke Diesel - Ford Truck Enthusiasts Forums forum.

 

the check engine light is not on and no codes were found.

 

Moved to the 6.0L Powerstroke Diesel forum.

 

Do you have access to a scan tool. You need to monitor ICP (pressure) and IPR duty cycle. Chances are there is a leak in the high pressure oil system.

Where in TX are you?

 

that's is what I am suspecting. thanks I will check on my scan tool to confirm.

 

Oh, I am in east Texas. Gladewater, it's near Longview

 

I know a Jerry Wallace in S. Tx. - thought that I might be able to help if you were that person. The STC fitting is the most likely issue if the leak is big enough for the low pressure oil pressure to "not build up".

 

As always, thanks for jumping in on this thread Mark. I know these folks are in good hands when I send them down here.

 

One question tho, if there was an oil pressure problem would the engine still run OK after start up? Also, it starts in the morrnings. I am sorry for all the stupid questions. I work on big trucks and equipment, don't know much about Ford injection system.

 

When the oil gets warm, the viscosity lowers. At 4000 psi, it will leak more when hot than when cold. That is a classic symptom of a HPO leak. The engine is hard to troubleshoot at times, so that is the reason for getting the readings I suggested. There is a "No Start troubleshooting" thread in the Tech Folder. You can find other troubleshooting suggestions there, but getting the truck scanned for codes and then collecting operating data is always the best way to go.

Can you explain your statement below a little better?

" I noticed that the oil pressure was not building up after turning engine over."

 

Can you get to the HPO without lifting the cab? I think I am going to let the Ford house do it.