When cranking the engine over.....the fuel seeps rather than squirts with any force from the injector line...
Well being you, at least we should be able to rule
out bleeding not being done correctly. Although yes, there should be a bleed screw on the IP. You need to bleed the filter, the line to the IP, the IP itself and then the lines to each injector and in that order. However......
I am leaning toward an IP problem if you are suspecting a poor fuel dose. However, the best way of testing that, is to remove an injector, refit
to the fuel line and then crank over and see if you get a spray of fuel. A couple of revolutions at the most should show you what you need to see. You will see one of three things.
A fine spray of fuel, which means fuel system is OK, fault somewhere else.
A poor squirt or dribble of fuel, which means the injectors need servicing. This will flood the cylinder and will not ignite the fuel during compression
No fuel at all, which means you could have
a fuel shutoff problem, or
an injector pump
If it is an IP problem, it is possible the governor or fuel rack is not operating correctly. Unless the IP has been off recently, I would rule
out timing issues. They don't or can't just fall out of time by a tooth or two.