First off, i've searched a fair bit on numerous sites. I dont know if i am in a different situation or have overlooked something.

1997 k3500 6.5lTD, open exhaust for the time being, other than that, stock.

less than a year old fuel tank/sender, hard fuel lines up to the LP, fuel injection line for the return and feed up tot he filter manager/IP. New LP/OPS less than a year ago. filter is good, visually inspected, and tank sock i checked a few weeks ago and looked brand new to me. water drain has a constant flow when running, and fuel shoots out of the filter purge easily. Truck had a PMD replaced prior to my ownership (stanadyne), and I have not yet taken the plunge on that (because of the cost).

So my issue is, from cold, it starts with a little extended cranking (always has) and will run great for some time, usually 30min to an hour of driving. Then i get a stall, or an almost stall. sometimes it works through it. When i re-start it, it seems like i have to let the LP run a few cycles before she wants to start, also having very extended cranking time. My fuel system is all relatively new, and seems to work great for the first part of a drive.

Now i know everyone is itching to say, relocate and buy a new PMD, and to be honest i think at this point even though i dont think that is what it is, it would be ruled out if i did get a new one.

Could it be as simple as something clogged in a line, or the sock clogged? maybe a clogged injector line? clogged injector? i am at a loss for new ideas here. I'm pretty mechanical and can fix just about anything, but this has me stumped. HELP?!?!?!!!