what should be the running fuel pressure 4.3 eng 2000 gmc serria 1500

76 to 86 Psi I believe and turn key should be 110 to 130psi

Sounds high 4.3 throttle body 2000. I was sure key on only engine off was around 60s but dont know running idle pressures

sorry I thought it said 5.3 I dont know for the 4.3 dang ok here is what you can do call local auto part store and ask them. the will tell you what fuel pressure that the pump should have I have to do this some times because it is not listed in a book. I'm sure they will tell you