I'm working on a t650 with a doosan engine that had weak injectors. Pulled injectors sent off to confirm, all four failed testing. Replaced all 4, fired engine which ran for 20 seconds and then died. Other than starting fluid it will not run. Rail pressure is exceeding 5k psi, filters are new, it appears the injectors simply aren't firing. I have no reason to think the ECU all of a sudden failed but I'm stumped at this point. Anyone encounter anything similar to this. Thanks I'm advance.