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Q: My truck runs for a few seconds then dies

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I replaced the fuel pump,relay, and pressure regulator in my 2001 dodge ram 1500. It starts but runs for a few seconds then dies. It has only 10lbs of pressure when it runs and 0 with just the key on. When it runs I can give it gas but it sputters team dies. What could be the problem?

My car has 396000 miles.
My car has an automatic transmission.

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