91chevyss- "also i think my pump only has 13 to 14 psi the vortec engines has 50 to 60 psi for tbi not sure though. one other thing i have open spacer not a 4 hole between carb and intake should i keep it on or take it off. thanks for all the help"
You are right about your in tank pumps only running 13 to 14 psi. Most people you talk to will tell you they should be running upwards of 50 or 60psi but on those really early 90's models and on the late 80's throttle body models they run a much lower psi than people think. I have a 1991 454 with a throttle body and it is suppose to run right around 14 psi. Now i took apart the throttle body and opened the regulator a bit and fit an in line 23psi pump on it for a little more power but the stock in tank ones are supposed to run 14. I ran into a lot of grief when i was trying to get a 21-25psi pump cause everyone was telling me it was not enough and trust me my truck is running like a champ.