i have a 91 civic with b18a1 motor in it and i have a b&m fpr on it. when i set the fuel pressure, do i set it to what i want it to stay at idle with the vaccum line on or off. my friend who helps me with my car set it to around 48 with it on which is around 58 wot right? my motor has b18b1 head,crower 402 cams, crower vlavesprings and retainers,jdm 4-1 header,blox intake manifold,2.5" catback exhaust,testpipe,cold air intake,xenocron chipped ecu, xenocron 255 fuel pump, and zex nitrous kit. my friend said that where he set it was good. anyone have any opinons?

 

What you need are facts and not opinions. You'll find them on the dyno doing some pulls with a/the wideband installed so you can see how rich/lean you're running. Then you'll know exactly what you should do.

 

i know but my real question is, is that how you adjust the fuel pressure with the vaccum line on and whatever it reads is what your fuel pressure should be? like how mine is reading 48 right now.

 

If your manual says that it should read 48 psi at idle with the hose on, then yes.

 

have you had it tuned? get it on the dyno