No voltage on injector lines following engine rebuild

I have a 2012 Ford Fiesta 1.4 L TDCi.

It was starting normally but the engine had major mechanical problems so I have rebuilt it and put it back in without touching any electrical part. Now I’m trying to start the engine but no luck so far.

Here’s what I’ve tested so far:

• tested the injector plug with light bulb and a multimeter during the ignition and startup but there is no 12 V on them (the black wire has no voltage in reference to plus or minus side of battery and the red wire has 1.2 V in reference to ground)
• checked for continuity from the plug to the ECU and it’s good
• also checked the power relay that supplies the ECU (the big one 40A) and it’s working but it is hot while ignition on.

What should I do now? The 1.4 TDCi engine also known as 1.4 HDi.

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Update

The engine turns fine with no weird noises when cranking and no smoke is coming out. and after someone suggested that the fault could be the lack of fuel pressure in the rail so the ECU won’t fire the injectors (which turned out to be right).

I removed the fuel tank while trying to get to the fuel pump because it was not making any noise to find that there is no pump only the fuel level sender.
Now I have the fuel in jug plus a manual pump connected to the fuel filter, I pump the fuel and crank to find that the injectors started to get 12v signal now and some black smoke is coming out but it didn’t start yet as the batteries are dead now. I noticed that it doesn’t have great suction on the intake for now.