OM606A start probs when above 85C...
OM606A start probs when above 85C...
If you’re talking a mechanical 7.5mm pump and not EDC 7.5mm, the crank sensor does nothing but run tachometer and run electronic idle speed regulation(which you also don’t even need). Definitely chase after those air bubbles and figure out where they’re coming from. Air is compressible and retards timing effectively and reduces fuel quantity injected.
You could have no crank signal, no glow plugs, hell.... no battery power even; and on a hot 85*C engine you could roll it over it should fire right off if injection is working correctly.