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Oil pressure gauge can anyone tell me if their gauge goes to zero when you turn off the engine(after warm up)?? If it does, how long does it take to go to zero?? This is for a 01 Tahoe LS. Thanks, Mike

I have a 01 tahoe 5.3 eng. What is the stock fuel pressure?? Also I replaced the fuel pump couple days ago and I used the old rubber seal/gasket from the old pump. Now I notice that every time I open the gas cap theres no pressure?? What's the worse that could happen?? Or what could...