Tahoe 1999 5.7L fuel pump died years ago, but after replacement the vehicle has had poor starting cold, very poor when very cold. But the car ran and I had to use it. Things got worse when a failing EGR valve added spice, but replacing that fixed those symptoms. Finally tested pressure at Schrader valve: 54 psi . Then checked max pressure by tapping into fuel line at filter, and 54 psi is the maximum ! Voltage is good as far as I can test it, until I drop the gas tank and test what is actually getting to the pump. OKAY, has anybody ever seen a replacement pump put out 54 psi max? By the way, I did change the fuel filter before I checked fuel pressure. Any ideas anybody? Maybe I should have changed the fuel filter at the same time I put in the replacement fuel pump. Reminds me of the time I forgot to turn on the air of my scuba tank as I hustled after the group I was guiding. You know the saying: The cobblers children have no shoes. Thanks, chicoche.