D60-6 Cummins NH 200 Running On

Gday all. Just wondering if any of you have come across a Cummins NH220 running on after shutdown (can be up to 30 seconds). Was fine before full engine over haul. Has a recon PT pump and new injectors. The overhead adjustments have been checked several times and all good, new filters and fuel, fuel float tank disassembled cleaned and inspected. On shut down with fuel return removed theres a large amount of spluttering fuel vapour not a solid stream of fuel as there should be. Obviously...

D60-6 Cummins NH 200 Running On

D60-6 Cummins NH 200 Running On