I'm ready to install my Walbro 255 fuel pump & Sards fuel pressure regulator. My question: What should the fuel pressure be at idle and at wide open throttle? I also could use your advise: The Sards fpr has an additional port on it and I'm wondering what I can put there - nitrous feed line, fuel pressure guage, etc. What would you use it for? If there is anything else I should do or if you just want to give me general ideas/advice your more than welcome. I should be installing these two parts on Tuesday of next week so any help would be very helpful and appreciated. Thank you! BTW - A week after I put in the pump and regulator I will be installing a ZEX wet kit running a 75 shot.

 

34 at idle, 43 at wot.

 

34 & 43 is the stock setting though. Don't I have to push out more fuel?

 

No, wait. You have a 5th gen, I do not know what your # should be. However, you want your car to idle at what ever your stock fp is.

 

Another related fuel-pressure question:

I was planning on installing my Walbro 255 HP pump and Aeromotive (? sp) regulator this weekend, but now I'm not so sure. I think that when the walbro is installed by itself, the pressure and volume from the pump will overwhelm the stock regulator.

The idea behind the new regulator is to cap-off the higher pressure by bypassing the extra fuel back to the tank, to the pressure manually set in the new regulator.

But what happens to the 34-43 psi change in fuel pressure now controlled by the stock 4th-gen regulator? Will the pressure stay at the Aeromotive's set point and not change to follow the stock pressures? If I set the Aeromotive to 43 psi, will the pressure stay there? This regulator is a bypass-only regulator with a high internal volume and a turbo pressure port which raises the pressure 1:1 with boost, but no vacuum sensing to drop the pressure.

Is this the wrong regulator for the walbro 255 HP??

 

So does anyone know what the fuel pressure should be for a 5th gen using a 255 and Sard fpr?

 

bump on the fuel-pressure and regulator questions.....

 

JuIced, what was is the part number on the walbro 255 fuel pump, because i looked on the website, and they dont have the application for the 5th gen. Thanks...

 

2k use the same pump as the 4th gens, however something on the pump needs to be cut off to make it fit into a 2k maxima.

 

GSS342 is the Walbro part number for the 255 Iph high pressure fuel pump