2009 Volvo CM871 Vapor locked, need help getting it started.

The filter has fuel, I checked and topped off. When I first removed the filter it still had fuel in it. Any advise on how to check the lines for blockage from the tank to the pump?

 

This is an ex swift truck. Only has 1 spin on filter at the pump.

 

Update: Truck is running now.
Ended up having to pressurize the tanks to get the fuel to the prime pump.

Used an air compressor via the breather tube to pressurize the passenger tank first. Vice grip pliers to pinch the line.

Then had a helper push the bleed valve with the prime pump going while adding pressure to the driver tank until fuel started to come out of the bleed valve.

Had to use starter fluid to spin the motor fast enough and prime the rest of the system.

Would like to thank everyone who responded.

Hope this helps someone in the future.
Pressurizing the tanks is what did it for me.