I have a 1998 chevy 3500 5.7 EFI I have replaced the fuel pump, and filter recently because the pump?

was no longer working. Now i have noticed when i am driving it looses fuel pressure, so i checked the pressure, it reads 64 psi when i turn on the key, but it immediately looses pressure to 0 psi, when I start it up it only reads 54 psi, but when i give it gas, it decreases. Is this problem due to my fuel pressure... show more was no longer working. Now i have noticed when i am driving it looses fuel pressure, so i checked the pressure, it reads 64 psi when i turn on the key, but it immediately looses pressure to 0 psi, when I start it up it only reads 54 psi, but when i give it gas, it decreases. Is this problem due to my fuel pressure regulator? or what......
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