So more update. Because of long crank time, finally I damaged the ring gear. :( :( :(
I got to sperate the tranny and engine replace the ring gear. Well, during this process I replaced the subframe bushing. Use the youtube volvo pepermint method, very good, about 20 mins per one bushing.
ok, after ...

Update: No, the quantum check valve won't work, it created too much pressure. So I had to take it out. Well, the long crank it is crank twice , each time about 2s not too bad. this is cold start, once warm it is one time crank

So some update. I removed the check valve. And put a straight hose on the section I disconnect. Why? because the Barb to bundy connector I can't take it off. So I have to leave it there. After a while I check the fuel hose, the auto zone fuel hose. It was cracking. After so much research, I found ...

Yes @ darrylrobert is right, my add on check valve blast out the fuel line. Later one website said this kind of one way valve only can apply to return fuel system. Do do this. It could cause big accident catch fire and burn the car

By the way my 2004 v70 2.5t only have 75k

Thank you CN90. Your posts help me a lot. Next I need to change crank seal. It leaks every where. Although my PCv didn’t clog at all. Do you think I should left the oil pump gasket alone?

I didn't use a new breather box. just use the oven cleaner to soup it over night. and Cab cleaner clean it good couple of times. Ideally, you can use diesel to soup inside.

Forget to mention, disconnect the negative battery.

So, I just did the pcv job, I had the manual, so I followed its way to clean pcv system. So I did not take off the intake manifold.

1. remove the power steering pump
2remove the alternator, not need to take out completely, just lay aside giving space.
3remove the intercooler pipe, coupling. 7mm ...

@ darrylrobert
Thank you for your interest on my thread. Well, I would say I admire you very much, I didn't have the courage or skill to try to get into the pump. So first of, how I diagnosis my issue? From my symptom: not just long crank but when I press the pedal gently it will helps. Besides ...