03 6.0L hard start issue

[jesshwarren]

Let me start by saying the truck has been run stock for the last few mo. It has been running great never any problems. 75K mi

Last night I went in to town came out of the store went to start the truck and it cranked but no start. I tried a few times and nothing. About 10 min later I try it again and after about 10 sec of cranking it started and ran great all the way home. I shut it off and it won't start after 15sec of cranking. I try again after 30 sec of cranking it slowly came to life on all 8 and revved to life.

Now it takes a few tries of 30sec cranking every time I try to start it it will crank faster faster faster and all at once vvrrooom it's running.

I am pretty sure this is HPOP related any ideas??

Once it is running it runs great.

[jesshwarren]

Checked into it with some data logging SW. It is a HPOP problem seems to be the regulator.

The problem has gone away for now.

HPOP is 630PSI at idle with a 23% duty cycle on the regulater.

I'll see how it does this week.