I have an '89 Iroc L98. It has 60k miles on it. I went to check the fuel pressure and primed the rails by turning the key on and off with the fuel pressure guage connected. It initially read 46psi but after about a minute it dropped 2psi and 5 minutes it read 40psi. It will probably be at zero in about 20minutes. I have checked the AFPR and it has no leaks, no leaks on new fuel guage eighter. I have heard that the TPI fuel rails should hold pressure for like 10hours. What could be wrong?
Thanks!!

 

My pressure is gone in 10 minutes. I wouldnt worry.

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89 FORMULA 350 Edelbrock Cat-Back ,March Pulleys,Super Coil,MSD 6AL ,Edelbrock TES's, AFPR ,Shiftkit, Edelbrock Base ,AS&M Runners, Edelbrock Waterpump, MSD 22# Injectors, Hoping for 13.5

 

Unless you're having hot start problems with extended cranking and a plume of black smoke and/or gas smell, don't worry about it.