Vauxhall Agila fuel problem

Fuel pump issue perhaps ,not familiar with the car type ,but would stick to the basics , plenty of fuel in the tank and is it getting pumped to the engine

Sometimes there's pressure at the injection rail but doesn't last long not enough to start engine was looking for and inline filter but cannot see one but there are 2 devices on return to tank one has a solenoid in it but can't get blow anything through it with pipes disconnected they are only push fit rubber so not high pressure, have bought a manual which came yesterday but us in cd form my computer not up to it so at a loss as to set up if system still

Could be fuel pressure regulator try clamping the return line see if that helps