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Jo is this the twin tank xj6 if it is lift the boot floor out and there is a fuel filter bolted in beside the spare wheel. Have someone turn the ING on while you listen to the fuel filter an you here it working. Try changing tanks and try again.
The fuel has to be under pressure in the fuel rail. Quick check for the pressure: pinch off the fuel return line and get an assistant to crank the engine. If it starts....it needs a new check valve in the rail. Fuel is just circulating in a loop from the tank. No pressure being generated to enable fuel injectors to "fire".
If FP ok, then check the neutral sw in the trans selector hsng. if not operated when selector is in P or N engine will not start.
Check air flap in the throttle valve body is not stuck in open position. and is free to operate.The idle bleed /cold start valve needs the air flap to be operational.
Check connecting bellows between throttle body and inlet m'fold to ensure no air leaks. If leaking it will by-pass the control in the throttle body.
Not aware of your skills so for me to start getting into the other possibles would be a bit premature.