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It might help if the hole was at 6:00

Yes there is a hole, the outer ring on the charge pump can be turned to line up with the hole, make sure that ring does not come of as the pump vanes are spring loaded. but no it is not tight enough in that hole to hold it in place

Let me go to the shop and look again

It should fit up flush like the picture, I do not see how the pump could have turned. It will not want to stay together at that angle, you may have to try and pass something through the fuel inlet fitting to hold it in place while screwing the cap on.

The reason it will not pull off easy is because the rubber end that seals against the part it is attached to has hardened, likely never seal again after you pull it off, ONE spec of crap gets into the inside of that screen and all the work was for nothing, Mail order another screen if you have...

It just pulls off, don't even mess with that filter get a new one. Do you have a local diesel injection shop??

They were never meant to be dissembled on the engine, like I said that is just a last ditch effort for someone with nothing to loose

Yes I would remove the lock, it has teeth that are engaged in the cap. I would not try to flow fuel backwards through the pump, there is probably check valves in the charge pump.

When I took it apart it was horizontal like being installed, all that came out is what you see in the pictures, it might be a challenge to get back together in that position. Also the regulator ass, shown in post #8 has the regulator piston, spring and plug in it, you do not want to dissemble...

You should have fuel flow out of the return port especially when running, not allot but flow, this flow cools the IP, but you have to have fuel going to the IP also. If you crack the inlet line is there good flow there? And yes the return check valve sounds normal. should take 2-4psi to open and...

You understand this is a last ditch effort before pulling the IP for rebuild, you want to make DANG sure you have a good fuel supply to the IP, a good voltage source to the IP and as before a clear return line before going into the end of the IP, I have no idea if that cap has some sort of...

Here are some pictures. there is a "keeper" threaded in at 12:00 to keep the cap from turning. Then three pieces will come out with the cap. the end of the IP will look like this, showing the small charge pump. And it should look like this when it goes back together. I have no idea if...

But before you go any farther you MUST make sure the return is not plugged, there is a check valve screwed into to top of the IP (return fitting) and if it gets trash in it or the return line is plugged it will give you the exact symptoms you have it will start and immediately shut down and then...

Yes it is threaded pictures to follow

That is a great question, let me go out to my shop and chuck up one of my scrap IPs in a vice and find out!

The screen should come out with the inlet fitting, sanitary conditions are a must, good luck!