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Well at least you are making progress!! PITA but much cheaper than a IP,

He blew through the return line

Does the "dribble" change just before it dies?

I have never seen the issue you are describing caused by the need to bleed, usually hard starting, rough running are the symptoms of air in the injector lines. So you say it starts, runs smoothly for 5-10min at idle and then just falls dead? Then how long do you have to wait until it will start...

OK I looked it up and GM went to a Stanadyne IP, looks like and probably acts the same as a Rosa Master

There should be a good steady flow from the hose, basically it is bypassing all the diesel the IP is not using with a little back pressure, I have made it home a couple times after drilling out the valve back in my 5.7L days, I have run my JD310 backhoe and 350 dozer for several months without...

I think this is a Rosa Master IP, what GM seems to like using, they are notorious for the rubber coupling (inside the IP) shedding pieces and plugging the return check valve, it is mounted in the pump and is part of the return fitting, If you unscrew the fitting there should be a small glass...