Y22dth engine won't start

[Tisu]

Hi,
I replaced the cylinder head gasket, and the fuel filter also,and now won't start the engine(it was working before)
I used a hand vacuum pump to draw the fuel from the tank up to the fuel pump.
But no matter how much I crank the engine, no fuel appears at the loosened injector unions.

What is the error?
Thank you .
Steve

[Andy B]

is the fuel pump running? Is there enough fuel in the tank? 

[Doctor Gollum]

Did you pre fill the fuel filter?

[TheBoy]

These pumps can be a sod to bleed.  The official kit  I seem to recall vacuums fuel to the HP pump, and then attaches the other side to bleed the injector rails.

These VP44 pumps are prone to damage if trying to start with air in the actual pump itself.

[TonyTorque]

Steve, a VP44 won't inject anything unless the engine ECU and the pump's own control unit both enable it. So if fuel is reaching the pump inlet but nothing comes out of the injector unions, look at the electrics before the pump itself. After a head job the usual suspects are a plug left off or damaged on the cam or crank sensor, or a loose earth on the head. Check the in-tank pump runs for a few seconds when you switch the ignition on, and that the inlet line to the VP44 is full with no air. Get the codes read too. A fault on the pump control unit or a missing sensor signal will show up straight away and saves cranking it to death. Keep the battery on charge while you test, as low cranking speed alone can stop it firing.