Fuel pressure problem

[cuznguido]

I have addressed everything I know to do. Tank is clean, new fuel lines, new fuel pump, new filter. Engine just had a good tune up and there are no spark issues. Turn key on and fuel pump runs and stops when pressure is built up as it should. Engine will start and run fine for a few seconds and then dies and no fuel pressure. What is there that I can check to find where this pressure has gone? There are no visible leaks and there does not appear to be fuel in the oil.

 

[Eman85]

Need to monitor fuel pump power once the engine starts to see if it's losing power.