SHIMMING THE SPRING ON A FASS to get 25 PSI

[Highfinance97]

Some people told me to stretch the spring on the fass to get more pressure (of course i did not listen to them idiots) STEVED told me he used a new spring to get 25 psi and the people at FASS told me to use a shim does anyone know what size shim i should use and where to get it???



Thanks Michael

 

[steved]

Some people told me to stretch the spring on the fass to get more pressure (of course i did not listen to them idiots) STEVED told me he used a new spring to get 25 psi and the people at FASS told me to use a shim does anyone know what size shim i should use and where to get it???



Thanks Michael

The spring I used came with the FASS... I believe it was their "29psi" spring... but it only gave me 25psi.



steved

 

[Highfinance97]

thanks steved lol you probobly think im nuts always bringing up these questions



thanks again Michael

 

[LowFly]

We have pressure springs now from 1001-1015. I will try to dig up some info on what pressure is what. I know the 1001 will get about 8ish. 1002 did about 20-21 on my truck. Ill get back to this one... ...

 

[EricBu12]

You know, I was at the nationals get together in Indiana in 02 and there was a bosch Engineer there to describe the new HPCR system and such, I described to him all the problems of the VP-44 with the failure of lift pumps and such, some people were going very high pressures like 30 and 40 psi...



He said the VP-44 would fail at high pressures. The max safe pressure for the VP-44 is 15 PSI. not much more than that. The Pump is able to go down to negative PSI but he admitted that negative PSI would damage it.



So I asked if a system that maintained 11-15 PSI all the time no matter what, would that be good?? He said yes.....



I have a 7# Pusher to the stock pump to a regulator that returns fuel to the filter before the pusher, and I maintain 11-15 PSI no matter what even at WOT and I have 450 HP at the wheels. ... ... So think twice on making a pump do more than it needs to do.

 

[Highfinance97]

You know, I was at the nationals get together in Indiana in 02 and there was a bosch Engineer there to describe the new HPCR system and such, I described to him all the problems of the VP-44 with the failure of lift pumps and such, some people were going very high pressures like 30 and 40 psi...



He said the VP-44 would fail at high pressures. The max safe pressure for the VP-44 is 15 PSI. not much more than that. The Pump is able to go down to negative PSI but he admitted that negative PSI would damage it.



So I asked if a system that maintained 11-15 PSI all the time no matter what, would that be good?? He said yes.....



I have a 7# Pusher to the stock pump to a regulator that returns fuel to the filter before the pusher, and I maintain 11-15 PSI no matter what even at WOT and I have 450 HP at the wheels. ... ... So think twice on making a pump do more than it needs to do.

I wanted to turn up the pressure B/C i removed the mechanical pump and ran the line directly to the injection pump.



I have a 12 valve



Thanks for the help and advise

Michael