Disco3club

Good day all, hope someone can help, got a disco 3 tdv6 and am having a problem starting, cranks quite a few times before it starts. This is what I have done already:
New injectors
Replaced cam sensor
Replaced crank sensor
Cleaned air sensors
No errors appear

Can someone tell me what the fuel rail pressure should be on cranking and running.

The motor does sound like it is fuel starvation but not sure.

Regards Simon

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There is a schrader valve at the back of the engine on the top that should be positive pressure when running - only a couple of PSI from memory. Also when turning the ignition on, you should get fuel out of it (But only a little wen you turn it on - need two people to check ideally! - if you have none or is very low, then the low pressure pump is probably FUBAR