Thread: 2014 diesel Hilux slow starting & loosing fuel prime.

Did you replace the injectors? or a garage? If a garage, go back to them.
Can you guarantee there is no debris that may have compromised the seal when refitting the injectors or the pipes?
A loose injector, perhaps the crush washer isn't sealing, or a loose pipe either at the injector or the pump, possibly. Either will be letting air in and losing prime.
Was the fuel filter replaced at the same time? it may not have sealed and is letting air in.
Loose hose clamp on fuel line from filter/primer housing to injector pump.
Brittle/cracked fuel hose, unlikely as not old enough.
Hand primer has failed and is letting air in.