Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi there, I am Cam. Are you testing return flow from the fuel pressure regulator #2 in the front of the drivers side fuel rail or overall return flow?
OK, do you have any codes set?
OK, That is also a regulator. So with it running and at 1800 rpm, what is the amount of fuel returned through that line at WHILE at 1800 RPM for 15 seconds?
I guess the long and short of this is that if no codes are set and that valve is returning too much then it needs to be replaced. Are you sure this is not covered by diesel warranty?
OK,m you are aware that by its design, there is ALWAYS some return flow from the injectors and that fusel flow is the result of the injection system using a bit of fuel to open the injectors?
And to be sure, you replaced the regulator in the end of the fuel rail? IF so, then did you remove the fuel regulator in the pump and inspect for debris there? I have a bulletin that may interest you.
Tell me how much fuel you measured over how long of cranking time?
Without your lift pump though. These don't use a lift pump normally so you supplying fuel all the time, it has to go somewhere. The systems uses amperage on that to control it. With the engine running at idle, it should be reading .2-.7 amps dc. More than this indicates a leak. IT may require the whole fuel rail not just the valve replacement.