An internal leak from either the high-pressure connector or the fuel injector will result in increased fuel return flow
from the cylinder head. Single cylinder cut-outs will not be able to isolate this leak because it occurs before it reaches
the control needle inside the injector. Because all injectors share the same pressurized fuel supply from the rail, all
cylinders will share the loss of fuel equally.
Due to the varying engine configurations, the following steps have been written to cover a majority of engine
configurations. Some of the illustrations may not represent the parts being removed or installed.
The purpose of the following Setup and Measure sections is to isolate and measure the injector return fuel drain flow.
In some configurations, this requires isolating the high pressure fuel pump and/or fuel rail pressure relief valve
fuel drain flows.
