Dieselbuilder

https://encrypted-tbn0.gstatic.com/i...QreJM-_6EByGXA This picture is worth 1000 words. I am trying to increase my fuel pressure. I have ordered two sets of springs from fass this is my 10th tempt to try to get 15 lbs pressure from this pump. As of now the best I can get is 13 after stretching the spring, Fass has had this pump twice one for fuel pressure the next time a new motor. I have done everything on the engine side to try to solve this with no luck and I have looked around for different springs but was not able to find any ( odd size just under 5/16 ) The springs that are coming are ? a 18 and 45 lbs to try cut down and or stretch. Short of buying a new regulated pump for my life time warranty pump and No I am not sending it back again, the time I send it back and forth I might as well buy one ..............So looking for any ideas would help, all this for a 3 dollar spring .thanks

Lary Ellis (Top)

A thought......how many different gauges have you tried to confirm the actual pressure?.....not uncommon for gauges to read a little high or low.

The other thing that comes to mind is have you confirmed there are no restrictions of any kind feeding the pump?

Dieselbuilder

Three, its not the gauge, I can pin the needle if I want it's trying to find the right spring. I think the configuration of the pump gear is a little different and without a few different pumps to pull apart and mic to confirm I am at a loss so trial and error, shims ???