2012 volvo hard start

So pinching off the line from the head to the filter housing is the injector return...loosing prime there means problem is ahead of the injectors which comes from the fuel filter housing.....blocking off the line from the filter housing to the tanks means and holding a prime means you holding fuel in the filter housing......common component...filter housing.
You can check the pressure on the "pressure side" and the "pressure side" of the housing.
If you send me a message with your contact info i can forward you a bit of info on checking this and the rest of the system....

 

If it's the secondary fuel filter (water seperator) you can remove the check valve and clean it.
Also, isn't there a check valve at the head as well?

 

I'm not sure if thats possible as i've never seen anyone post up anything about it......one of these days i'm going to take mine off and tear it apart...the manual pump is leaking anyways so i have nothing to loose.