TBI Fuel Pressure

[biggsteve97]

I have an 87 Silverado with a built 350 TBI. And I am trying to find information concerning a possible issue with fuel pressure. I have been unable to find any info online or thru gm and gm service manuals. With my pressure tester connected key on engine off the fuel pressure jumps strong to 18 psi but the second the pump shuts off the fuel pressure drops like a rock to 0 psi. I know that these throttle bodies have a bleed off to allow pressure to drop when the engine isnt running but I am unable to confirm how fast or slow the pressure is suppose to drop. No tests I have found are concerned with this they are only concerned with the pressure itself. I am questioning this because I have a hard start and an intermittent no start at operating temp only. Once it starts whether I wait the 3-5 mins or shoot a very short burst of either in it it runs great as if nothing is wrong. The fuel pressure drop after pump prime or engine shut off is the only thing I cannot find info on or confirm. I dont believe the drop should be instantaneous but unable to find out. Any thoughts would be appreciated.