6.7L Cummins Injectors and Fuel Lines – Fuel Pressure Relief Valve – Measure

If available , run the engine, use INSITE’M electronic service tool fuel pressure override test. Otherwise , run at
idle. Place the end of the fuel drain hose, or pressure gauge adapter, in a bucket and measure the flow.
Specification At Idle: No flow.
INSITE”‘ electronic service tool override: Maximum of 1 drop per second (16 ml per minute or 0.5 ounce per
minute).
NOTE: If return flow from rail pressure relief valve is greater than specification, restart engine and bring to high
idle. The engine will attempt to reseat the valve.
NOTE: If Fault Codes 449 , 1911, 2311 , 272, 553, or 2216 are active, do not replace the fuel rail pressure relief valve
without first determining the cause of the fault condition.
See the appropriate troubleshooting tree(s).
If the valve does not reseat, replace valve .