Does anyone have a link for the diagram? Having cold starting issues. Changed the relay and glow plugs with no luck. PO has some weird crap going on in there so I need to put it all back correctly.
Sounds to me like you have an air leak into the system.
Could be a bad filter gasket, or o-ring. If a diesel sucks air, it will not start.
Have you tried bleeding the system before starting?
Have you tested with a timing light to see if the glow plugs are working?