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the injector pump was leaking on my 04 duramax (lly) i switched it with a new one put it back together and the truck started fine ran for 30-40 seconds then it blew off the return line on the right side of the motor. Does anyone have any pointers?

Hello I drive a 2004 Chevy duramax (lly) 2500HD 4X4. I have a 5 inch turbo-back exhaust and a bully dog tunner