No oil pressure after changing low pres. oil pump on 7.3 p-stroke?

Question

I was having a long crank issue with my powestroke and noticed that is was taking a while for the oil pressure gauge to move and was taking a while for the high pressure resivor to fill. So i changed the low pressure oil pump and now NOTHING haha. I can crank and crank and it never builds pressure. Any Ideas?
Thanks

Answer 1

Did you pre lube the pump when you installed it. If they are dry they will not pump. I had a powerstroke come in once with a no start condition, no oil pressure, found a 1/2 pipe plug in the oil passage on the back side of the timing cover that came out.



Also a weak low pressure oil pump would not cause your extended crank time. The low pressure pump fills the reservoir for the high pressure pump. It would remain full after you shut the engine off and have enough oil in it to start and run the engine for a few seconds then it would stall if the low pressure pump did not fill the reservoir in time. Usually if the high pressure oil system is causing the extended start it is because of leaking injector seals. I have put so many injector seals in powerstokes it makes me sick to see them come in the door. A good tell tale sign is oil in the fuel filter housing, fuel will be black. If it is you definitely have a injector seal or injector itself leaking. I only seen one with a bad injector causing it but did not have a hard start condition just used lots of oil.

Answer 2

If your using the dash gauge it noting more than an idiot gauge just telling you when its running you either have pressure or no pressure,

Check the HPOP tank, see if there is any oil in it. If aint then check the fuel filter bowl for oil in the fuel. Oil in the fuel means injector orings are bad.

Also, guess on the engine is expensive. You really need to hook a diesel scanner up to it to ready duty cycle, buzz test. It could something as simple as a bad GPR prior to a CPS sensor to a IPR sensor.

If it cranks and wont fire, verify you have more than 10V from the battery. she wont fire if the pcm sees less than 10V. It could 10 different things with out the scanner its a guessing game. Also, make sure your oil level is right. Too low and the truck wont start either. Crankalank all day long.

Answer 3

I also have a buddy who has a '91 dakota that did an identical challenge. He replace the the two the swap and the pump a number of cases. additionally, he replaced the wiring and a few relay is the lower back of the meter set. by no ability fixed the subject for long. We examined the oil presure 5 cases and it constantly had sturdy tension. The truck nonetheless runs right this moment with 465k on it. go discern?