Pressure will be dependant on how long ago you primed and/or ran the fuel pump. Overnight would be enough to depressurise so a dribble would be expected.

The CSV gets its fuel supply directly (well not quite - but trying to keep it simple), where as the injectors rely on the internal vale opening up the fuel ports inside the metering unit. If the valve (aka plunger) is stuck/sticking or those ports are gunked up, pressure will be naff.

The best test is to get all 4 injectors out of the inlet, then screw them back into the fuel lines,
Tighten everything back down on the metering unit.
Disconnect the CSV (electrical plug)
Place the 4 injectors into some kind of container (a pint glass each or something).
Then crank the engine and observe the spray patterns.

If nothing, or a dribble, then lift the metering unit plate slowly (and carefully) - found under the rubber boot. Again, see what happens at the injector end - pressure should rise rapidly if the MU plunger/ports are working as expected.