Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,The problem you are describing sounds like you have a fuel pressure concern. I would start first with installing your fuel pressure gauge and monitoring the fuel pressure. Normal pressure on the G20 needs to be right at 60 to 66 PSI, anything less then 60 PSI would indicate you have a failing fuel pump. Check this for me and post back if you need more help and or have more questions.
There are no control valve beside the fuel pressure regulator. Where is your pressure when it dies on you, it should not be lower then 60. If it is then that usually means the pump is weak and needs replacement.