i'm tring to find out if the holley spring will fit in the stock fuel pressure regulator. my stock is cranked up to 13 psi and won't go any higher. the car is very lean all the time. it ran slightly rich till i modded the y pipe to 3' from 2.25. the car ran very strong before and it feels stonger now just lean and i'd rather be allittle fat then lean. i think i can fix this with fuel pressure adjustment of a few pound. any and all info would be helpfull

 

check top down solutions for alternative spring. holley TBI uses a much higher pressure if i recall. i think holley is at 20 lbs. TDS is one step stronger than stock. are you sure your pump is up to the task?