Any codes? Will it start & run with a shot of either? Disconnect your grid heater before attempting. Pull the filter minder & give it a squirt into the air box.
If it starts & runs, it could be a few things causing high fuel return. ECM needs 5000psi rail pressure before firing injectors. Do you have any way to monitor rail pressure while cranking?
Slow cranking speed, Bad injectors, High pressure fuel relief valve, loose injector flow tubes all can contribute to no start. Maybe a bad FCA??
Start by checking torque on connector tubes to 43#\ft, next would be installing a cheap fuel rail plug where the HPFRV goes. Try disconnecting the FCA then try to start. It will cause the CP3 to default at max rail pressure of 26kpsi. Don’t run for long line this (30seconds). If that doesn’t work, try capping each injector 1 at a time to determine if one is leaking.
If original injectors at 191k miles, they could be suspect that 1 or more has failed.
If it starts & runs, it could be a few things causing high fuel return. ECM needs 5000psi rail pressure before firing injectors. Do you have any way to monitor rail pressure while cranking?
Slow cranking speed, Bad injectors, High pressure fuel relief valve, loose injector flow tubes all can contribute to no start. Maybe a bad FCA??
Start by checking torque on connector tubes to 43#\ft, next would be installing a cheap fuel rail plug where the HPFRV goes. Try disconnecting the FCA then try to start. It will cause the CP3 to default at max rail pressure of 26kpsi. Don’t run for long line this (30seconds). If that doesn’t work, try capping each injector 1 at a time to determine if one is leaking.
If original injectors at 191k miles, they could be suspect that 1 or more has failed.
