hey guys i got a fuel pressure gauge on my car and i was just want to make sure my fuel pressure is fine,
its a 93Z28 A 4
when i turn they key, fuel pump primes and it goes to 38psi, i turn the car on and it idles at 30psi when im driving around taping the gas normal driving it hits 35psi and at WOT it hits about 39-40psi. the car is pretty much stock with the basic boltons,(see sig) and i havent mess with the fuel pressure. does this sound right? or shoud it be a little higher?

 

I would say yours is on the fringe. At WOT or with the vacuum line off to the regulator, it should be 41-47 psi. If you have not replaced the fuel filter lately, I would do that. I would not worry too much about it unless you are experiencing driveability problems.

 

i changed the filter about a year ago but i plan on chaninging again this weekend.

the car drives fine, but it started to act different after i changed the plugs to autolite 103's gapped at .38. when driving the car and waiting on stop light the rpm drop about 100 or rpm and hte car shakes but then it jumps back up really fast to normal, weird thing is i think is my batter voltages drops and the lights kinda dim.

thanks

 

dammit angel.. I sold you that brand new 255HP Walbro for 30 bucks and you STILL haven't put it in your car.. Don't let your nawz kit rely on that POS stock pump. You already have it, why not put it in....
PS...
You should be high 30's low 40's at idle
Mid 40's at WOT
Priming at mid 40's