ok so im running a weiand 174 blower (pretty much) and a holley 750 cm 4 barl. dlb pump carb what psi rating should my feul pump be at....

 

most pumps operate at 9-14 psi, If you are looking for an awesome pump, I use weldon fuel pumps. best out there imo, expensive but well worth it. easttennmotors.com

 

Most of the mechanical pumps listed on Summit are in the 6-8 psi range. Anything above that and you're going to have to add a regulator. Blower or not, I can't imagine your Holley carb wants to see any different pressures than the 5 to 7-1/2 psi specified in the manual.

I've never added a supercharger and admittedly know very little about them, but I do know that Holley sells carbs designed for use with roots style superchargers.

 

You really need to know the fuel flow of the pump, not necessarily the pressure. The Holley carb will only handle 5-7 psi itself, and will handle quite a bit of flow.

Read this.

 

the blower hes using is a 671 a small roots as long as the carb isnt to small for the engine cfm is not a problem.colorad is right its not your psi is your flow rate gallons pre hour.