I am buying the walbro 255LPH fuel pump but i am not sure if I should get the standard or the high pressure one. I am going to be using it on an N/A motor with 200cc/64cc heads and a holley stealth ram with a 58mm TB and 30lb injectors
thanks

 

With the right size injectors there's no need to overdrive them, so a standard pressure high volume would probably be better.

 

Are you saying a standard high pressure pump or a high performance high pressure pump? You will need a pump that is capable of supplying around 50 PSI for the injectors to work.

 

I bought a walbro 255lph pump for a TPI camaro and it says to specify if you want the standard or high pressure pump, and I am not sure which one i need.

 

I think what they mean is pressures above 50psi, I've heard of people running as high as 65psi. But the life of the injector is shortened and the risk of hydrolic lock up is increased, meaning you get on a run and the injector hangs wide open flooding a cylinder.
Properly sizing injectors and running aprox 48psi work great!..I have'nt seen any Dyno Sheets that show any "decent" gains in HP above 48psi..
Pressure dictates the spray pattern, custom programming dictates the "open time"or "Pulse width", and the size rating/ the flow capacity..

 

oh ok, i just wanted to make sure the standard pump could support 50psi, cause thats about what i will be using at the track, and 65 psi is way to much for me, i don't want to break anything. I will get the standard pump , thanks a lot 90rocz I appreciate the help.