Replacing o ring fuel line into head

[Rawze]

(12-13-2017 )Rounded_nut Wrote:  I have a small leak on the line from the rail into the head, having not opened the fuel system there, do I need to release pressure in the line before hand or does it depressurize when the engine is off?

CM2350

As others have said, relieve the pressure with the proper procedure or seek professional help. The fuel system on those common rail engines is extremely dangerous. Fuel pressures are so high, they can slice through flesh and bone if not dealt with properly.